Fail build if there are compiler warnings

Closes #1065

Author: jberkel

.github/workflows/build.yml

@@ -17,6 +17,10 @@ jobs:
         brew outdated swiftlint || brew upgrade swiftlint
     - name: "Lint"
       run: make lint
+    - name: "Run tests (PACKAGE_MANAGER_COMMAND: test)"
+      env:
+        PACKAGE_MANAGER_COMMAND: test -Xswiftc -warnings-as-errors
+      run: ./run-tests.sh
     - name: "Run tests (BUILD_SCHEME: SQLite iOS)"
       env:
         BUILD_SCHEME: SQLite iOS
@@ -57,7 +61,3 @@ jobs:
       env:
         CARTHAGE_PLATFORM: tvOS
       run: ./run-tests.sh
-    - name: "Run tests (PACKAGE_MANAGER_COMMAND: test)"
-      env:
-        PACKAGE_MANAGER_COMMAND: test
-      run: ./run-tests.sh

Sources/SQLite/Core/Connection.swift

@@ -434,7 +434,7 @@ public final class Connection {
         }
     }
 
-    @available(OSX, deprecated: 10.2)
+    @available(OSX, deprecated: 10.12)
     @available(iOS, deprecated: 10.0)
     @available(watchOS, deprecated: 3.0)
     @available(tvOS, deprecated: 10.0)