Add GitHub CI workflow (#4)

* Remove .travis.yml

* Add GitHub CI workflow

* README.md: Remove Travis badge

Author: xtian

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: Elixir CI
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    container:
+      image: elixir:1.9.1-slim
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Install Dependencies
+        run: bin/setup
+        env:
+          CI: 1
+          MIX_ENV: test
+
+      - name: Run Tests
+        run: bin/test
+        env:
+          CI: 1
+          MIX_ENV: test

.travis.yml

@@ -1,7 +1,5 @@
 # plug_content_security_policy
 
-[![Build Status](https://secure.travis-ci.org/xtian/plug_content_security_policy.svg?branch=master
-"Build Status")](https://travis-ci.org/xtian/plug_content_security_policy)
 [![Hex](https://img.shields.io/hexpm/v/plug_content_security_policy.svg)](https://hex.pm/packages/plug_content_security_policy)
 
 This is a [Plug][plug] module for inserting a [Content Security Policy][csp]

README.md

@@ -10,9 +10,9 @@ if [[ -z "$CI" ]]; then
     asdf plugin-add elixir || true
     asdf install
   fi
-
-  mix local.hex --force --if-missing
-  mix local.rebar --force
 fi
 
+mix local.hex --force --if-missing
+mix local.rebar --force
+
 mix deps.get