Bump acorn from 5.7.3 to 5.7.4 in /example

Bumps [acorn](https://github.com/acornjs/acorn) from 5.7.3 to 5.7.4.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@5.7.3...5.7.4)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

example/package-lock.json

@@ -662,6 +662,16 @@
     exec-sh "^0.3.2"
     minimist "^1.2.0"
 
+"@freakycoder/react-native-header-view@^0.4.11":
+  version "0.4.13"
+  resolved "https://registry.yarnpkg.com/@freakycoder/react-native-header-view/-/react-native-header-view-0.4.13.tgz#05e9d98608fd68eecf3aaf811453e8236b96ce6c"
+  integrity sha512-SGx5GWHwWcsDgHuu29s00E9zB6Chps8FJxS5MiRayd9YPHflmD6VK4QX7oXuR7bUqJyyySpdPcO4DUkTpr/aUg==
+
+"@freakycoder/react-native-helpers@0.0.21":
+  version "0.0.21"
+  resolved "https://registry.yarnpkg.com/@freakycoder/react-native-helpers/-/react-native-helpers-0.0.21.tgz#f5377f2f927fcf1a4b177ab7908f480f2314ead6"
+  integrity sha512-opPtI5F6+TgHowtKEHw+9h7InFNQc9M5hOPOen14iRpROOozeleCiWOsIIr15cjWg/A3xpt50M9r1gbQyCOuBQ==
+
 "@hapi/address@2.x.x":
   version "2.1.4"
   resolved "https://registry.yarnpkg.com/@hapi/address/-/address-2.1.4.tgz#5d67ed43f3fd41a69d4b9ff7b56e7c0d1d0a81e5"
@@ -1115,9 +1125,9 @@ acorn-walk@^6.0.1:
   integrity sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA==
 
 acorn@^5.5.3:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
-  integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
+  version "5.7.4"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.4.tgz#3e8d8a9947d0599a1796d10225d7432f4a4acf5e"
+  integrity sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==
 
 acorn@^6.0.1:
   version "6.3.0"
@@ -4015,7 +4025,7 @@ lodash.unescape@4.0.1:
   resolved "https://registry.yarnpkg.com/lodash.unescape/-/lodash.unescape-4.0.1.tgz#bf2249886ce514cda112fae9218cdc065211fc9c"
   integrity sha1-vyJJiGzlFM2hEvrpIYzcBlIR/Jw=
 
-lodash@^4.17.10, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.5, lodash@^4.3.0:
+lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.5, lodash@^4.3.0:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
@@ -5220,6 +5230,25 @@ react-is@^16.8.1, react-is@^16.8.4, react-is@^16.9.0:
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.12.0.tgz#2cc0fe0fba742d97fd527c42a13bec4eeb06241c"
   integrity sha512-rPCkf/mWBtKc97aLL9/txD8DZdemK0vkA3JMLShjlJB3Pj3s+lpf1KaBzMfQrAmhMQB0n1cU/SUGgKKBCe837Q==
 
+react-native-dynamic-vector-icons@0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/react-native-dynamic-vector-icons/-/react-native-dynamic-vector-icons-0.2.1.tgz#6859d0aac7e00f831a30de612c905bd4d08da555"
+  integrity sha512-C5BZ3rxkRAkzCOIwZSlZReNPfco8smWHicnKc5Z60nr7ibyaV/6EugDmf/eUuHAl4qdsYnRdSm7q1Ag627ZARQ==
+
+react-native-linear-gradient@^2.5.6:
+  version "2.5.6"
+  resolved "https://registry.yarnpkg.com/react-native-linear-gradient/-/react-native-linear-gradient-2.5.6.tgz#96215cbc5ec7a01247a20890888aa75b834d44a0"
+  integrity sha512-HDwEaXcQIuXXCV70O+bK1rizFong3wj+5Q/jSyifKFLg0VWF95xh8XQgfzXwtq0NggL9vNjPKXa016KuFu+VFg==
+
+react-native-vector-icons@^6.6.0:
+  version "6.6.0"
+  resolved "https://registry.yarnpkg.com/react-native-vector-icons/-/react-native-vector-icons-6.6.0.tgz#66cf004918eb05d90778d64bd42077c1800d481b"
+  integrity sha512-MImKVx8JEvVVBnaShMr7/yTX4Y062JZMupht1T+IEgbqBj4aQeQ1z2SH4VHWKNtWtppk4kz9gYyUiMWqx6tNSw==
+  dependencies:
+    lodash "^4.0.0"
+    prop-types "^15.6.2"
+    yargs "^13.2.2"
+
 react-native@0.61.4:
   version "0.61.4"
   resolved "https://registry.yarnpkg.com/react-native/-/react-native-0.61.4.tgz#9ec6e8a2aa8eac57143dcfa39115c7d9a139bc2c"
@@ -5270,10 +5299,10 @@ react-test-renderer@16.9.0:
     react-is "^16.9.0"
     scheduler "^0.15.0"
 
-react@16.9.0:
-  version "16.9.0"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.9.0.tgz#40ba2f9af13bc1a38d75dbf2f4359a5185c4f7aa"
-  integrity sha512-+7LQnFBwkiw+BobzOF6N//BdoNw0ouwmSJTEm9cglOOmsg/TMiFHZLe2sEoN5M7LgJTj9oHH0gxklfnQe66S1w==
+react@16.12.0:
+  version "16.12.0"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.12.0.tgz#0c0a9c6a142429e3614834d5a778e18aa78a0b83"
+  integrity sha512-fglqy3k5E+81pA8s+7K0/T3DBCF0ZDOher1elBFzF7O6arXJgzyu/FW+COxFvAWXJoJN9KIZbT2LXlukwphYTA==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
@@ -6653,6 +6682,14 @@ yargs-parser@^13.1.1:
     camelcase "^5.0.0"
     decamelize "^1.2.0"
 
+yargs-parser@^13.1.2:
+  version "13.1.2"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-13.1.2.tgz#130f09702ebaeef2650d54ce6e3e5706f7a4fb38"
+  integrity sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==
+  dependencies:
+    camelcase "^5.0.0"
+    decamelize "^1.2.0"
+
 yargs-parser@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-7.0.0.tgz#8d0ac42f16ea55debd332caf4c4038b3e3f5dfd9"
@@ -6678,6 +6715,22 @@ yargs@^12.0.5:
     y18n "^3.2.1 || ^4.0.0"
     yargs-parser "^11.1.1"
 
+yargs@^13.2.2:
+  version "13.3.2"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-13.3.2.tgz#ad7ffefec1aa59565ac915f82dccb38a9c31a2dd"
+  integrity sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==
+  dependencies:
+    cliui "^5.0.0"
+    find-up "^3.0.0"
+    get-caller-file "^2.0.1"
+    require-directory "^2.1.1"
+    require-main-filename "^2.0.0"
+    set-blocking "^2.0.0"
+    string-width "^3.0.0"
+    which-module "^2.0.0"
+    y18n "^4.0.0"
+    yargs-parser "^13.1.2"
+
 yargs@^13.3.0:
   version "13.3.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-13.3.0.tgz#4c657a55e07e5f2cf947f8a366567c04a0dedc83"