Fix branch and triple in compatibility.yml (#105)

`master` doesn't exist in our repository, so the workflow wasn't triggered. Also, the triple option had a typo, not sure how that even worked 🤔

Author: MaxDesiatov

.github/workflows/compatibility.yml

@@ -2,22 +2,23 @@ name: Check compatibility
 on:
   pull_request:
   push:
-    branches: [master]
+    branches: [main]
 jobs:
   test:
     name: Check source code compatibility
     runs-on: Ubuntu-18.04
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
         with:
           fetch-depth: 1
       - name: Run Test
         run: |
+          set -eux
           git clone https://github.com/kylef/swiftenv.git ~/.swiftenv
           export SWIFTENV_ROOT="$HOME/.swiftenv"
           export PATH="$SWIFTENV_ROOT/bin:$PATH"
           eval "$(swiftenv init -)"
           make bootstrap
           cd Example
-          swift build --triple wasm32-unknonw-wasi
+          swift build --triple wasm32-unknown-wasi