Migrate to github actions + enable Pharo 9 in CI

Author: jecisc

.github/workflows/continuous.yml

@@ -0,0 +1,30 @@
+name: CI
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the development branch
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    types: [assigned, opened, synchronize, reopened]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        smalltalk: [ Pharo64-6.1, Pharo64-7.0, Pharo64-8.0, Pharo64-9.0 ]
+    name: ${{ matrix.smalltalk }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: hpi-swa/setup-smalltalkCI@v1
+        with:
+          smalltalk-version: ${{ matrix.smalltalk }}
+      - run: smalltalkci -s ${{ matrix.smalltalk }}
+        shell: bash
+        timeout-minutes: 15
+

.travis.yml

@@ -83,9 +83,9 @@ Thus, it should be safe to depend on a fixed major version and moving minor vers
 
 ## Smalltalk versions compatibility
 
-| Version 	| Compatible Pharo versions 	|
+| Version 	| Compatible Pharo versions 		|
 |-------------	|---------------------------	|
-| 1.x.x       	| Pharo 61, 70, 80		|
+| 1.x.x       	| Pharo 61, 70, 80, 90			|
 
 ## Contact