Added check of homebrew.

Author: Reedyuk

.github/workflows/pull_request.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: Install Homebrew
-      run: /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
+      run: brew -v
     - name: Install Carthage
       run: brew install carthage
     - name: Assemble