iOS: bump build number

Change-Id: I19ae5cfed8f60e32e13ed2db2cd0d6a2e9214570
diff --git a/Ring/Ring.xcodeproj/project.pbxproj b/Ring/Ring.xcodeproj/project.pbxproj
index 88d1a20..74672d5 100644
--- a/Ring/Ring.xcodeproj/project.pbxproj
+++ b/Ring/Ring.xcodeproj/project.pbxproj
@@ -3250,7 +3250,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = MSHYCBXK85;
 				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = arm64;
@@ -3291,7 +3291,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Distribution";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Distribution";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEVELOPMENT_TEAM = "";
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
@@ -3635,7 +3635,7 @@
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 3;
+				CURRENT_PROJECT_VERSION = 4;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";