Merge pull request #1744 from chenyufeng1991/master

add *.xcscheme to Global/Xcode.gitignore,Objective-C.gitignore and Sw…

Global/Xcode.gitignore

@@ -21,3 +21,4 @@ xcuserdata
 *.xccheckout
 *.moved-aside
 *.xcuserstate
+*.xcscheme

Objective-C.gitignore

@@ -22,6 +22,7 @@ xcuserdata
 *.moved-aside
 *.xcuserstate
 *.xcscmblueprint
+*.xcscheme
 
 ## Obj-C/Swift specific
 *.hmap

Swift.gitignore

@@ -22,6 +22,7 @@ xcuserdata
 *.moved-aside
 *.xcuserstate
 *.xcscmblueprint
+*.xcscheme
 
 ## Obj-C/Swift specific
 *.hmap