Fix nullability warning in BGMXPCHelper. Also add Xcode 8.3 to .travis.yml.

Fixes #107.

.travis.yml

@@ -1,6 +1,10 @@
 language: objective-c
 matrix:
   include:
+    - os: osx
+      osx_image: xcode8.3
+      xcode_sdk: macosx10.12
+      sudo: required
     - os: osx
       osx_image: xcode8.2
       xcode_sdk: macosx10.12

BGMApp/BGMXPCHelper/main.m

@@ -58,14 +58,14 @@
 
 #pragma clang assume_nonnull begin
 
-int main(int argc, const char *argv[]) {
+int main(int argc, const char* __nullable argv[]) {
     #pragma unused (argc, argv)
     
     DebugMsg("BGMXPCHelper::main: Service starting up");
     
     // Set up the one NSXPCListener for this service. It will handle all incoming connections. This checks our service in with
     // the bootstrap service.
-    NSXPCListener *listener = [[NSXPCListener alloc] initWithMachServiceName:kBGMXPCHelperMachServiceName];
+    NSXPCListener* listener = [[NSXPCListener alloc] initWithMachServiceName:kBGMXPCHelperMachServiceName];
     BGMXPCListenerDelegate* delegate = [BGMXPCListenerDelegate new];
     listener.delegate = delegate;
     

build_and_install.sh

@@ -61,6 +61,8 @@ error_handler() {
          "is alpha software so you never know." >&2
     echo >&2
     echo "To try building and installing without this build script, see MANUAL-INSTALL.md." >&2
+    echo >&2
+    echo "You can also try ignoring compiler warnings with: $0 -w" >&2
 
     # Finish logging debug info if the script fails early.
     if ! [[ -z ${LOG_DEBUG_INFO_TASK_PID:-} ]]; then