update build to use 5.2 (#12)

Author: dastrobu

.travis.yml

@@ -17,6 +17,9 @@ jobs:
     - os: osx
       osx_image: xcode11.2
       env: SWIFT_VERSION=5.1
+    - os: osx
+      osx_image: xcode11.2
+      env: SWIFT_VERSION=5.2
 
 install:
   - eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"

README.md

@@ -1,6 +1,6 @@
 # AccelerateArray
 
-[![Swift Version](https://img.shields.io/badge/swift-5.1-blue.svg)](https://swift.org) 
+[![Swift Version](https://img.shields.io/badge/swift-5.2-blue.svg)](https://swift.org) 
 ![Platform](https://img.shields.io/badge/platform-osx--64-lightgray.svg)
 [![Build Travis-CI Status](https://travis-ci.org/dastrobu/AccelerateArray.svg?branch=master)](https://travis-ci.org/dastrobu/AccelerateArray) 
 [![documentation](https://github.com/dastrobu/AccelerateArray/raw/master/docs/badge.svg?sanitize=true)](https://dastrobu.github.io/AccelerateArray/)