Bump CocoaPods so lints pass

Author: mxcl

.travis.yml

@@ -14,7 +14,7 @@ jobs:
       os: osx
       language: objective-c
       before_install:
-        gem install cocoapods --prerelease --version 1.6.1
+        gem install cocoapods --prerelease --version 1.7.0.beta.3
       install:
         carthage bootstrap --no-build PromiseKit
       script: |
@@ -32,7 +32,7 @@ jobs:
       env: SWIFT=3.3
       name: pod lib lint --swift-version=3.3
     - <<: *pod
-      osx_image: xcode10
+      osx_image: xcode10.1
       env: SWIFT=3.4
       name: pod lib lint --swift-version=3.4
     - <<: *pod
@@ -44,7 +44,7 @@ jobs:
       env: SWIFT=4.1
       name: pod lib lint --swift-version=4.1
     - <<: *pod
-      osx_image: xcode10
+      osx_image: xcode10.1
       env: SWIFT=4.2
       name: pod lib lint --swift-version=4.2
     - <<: *pod