Bumped MacPass version to 0.7.4

MacPassHTTP no longer builds against 0.7.1.

Author: EpicVoyage

README.md

@@ -31,7 +31,7 @@ carthage bootstrap --platform macOS
 cd ..
 git clone https://github.com/mstarke/MacPass
 cd MacPass
-git checkout 0.7.1
+git checkout 0.7.4
 git submodule update --init --recursive
 carthage bootstrap --platform macOS
 ```