Add pod MASShortcut 2.3.6

Pods/MASShortcut/Framework/MASKeyMasks.h

@@ -0,0 +1,18 @@
+#import <Availability.h>
+
+// https://github.com/shpakovski/MASShortcut/issues/99
+//
+// Long story short: NSControlKeyMask and friends were replaced with NSEventModifierFlagControl
+// and similar in macOS Sierra. The project builds fine & clean, but including MASShortcut in
+// a project with deployment target set to 10.12 results in several deprecation warnings because
+// of the control masks. Simply replacing the old symbols with the new ones isn’t an option,
+// since it breaks the build on older SDKs – in Travis, for example.
+//
+// It should be safe to remove this whole thing once the 10.12 SDK is ubiquitous.
+
+#if __MAC_OS_X_VERSION_MAX_ALLOWED < 101200
+#define NSEventModifierFlagCommand  NSCommandKeyMask
+#define NSEventModifierFlagControl  NSControlKeyMask
+#define NSEventModifierFlagOption   NSAlternateKeyMask
+#define NSEventModifierFlagShift    NSShiftKeyMask
+#endif