enable automatically manage signing

Author: Martin Barreto

Example.xcodeproj/project.pbxproj

@@ -264,7 +264,7 @@
 28B3B8551BFA7EEC007337A2 = {
 CreatedOnToolsVersion = 7.1;
 LastSwiftMigration = 1000;
-ProvisioningStyle = Manual;
+ProvisioningStyle = Automatic;
 };
 28B3B8691BFA7EEC007337A2 = {
 CreatedOnToolsVersion = 7.1;
@@ -529,7 +529,8 @@
 isa = XCBuildConfiguration;
 buildSettings = {
 ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-CODE_SIGN_STYLE = Manual;
+CODE_SIGN_IDENTITY = "iPhone Developer";
+CODE_SIGN_STYLE = Automatic;
 DEVELOPMENT_TEAM = "";
 INFOPLIST_FILE = Example/Info.plist;
 LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
@@ -546,7 +547,8 @@
 isa = XCBuildConfiguration;
 buildSettings = {
 ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-CODE_SIGN_STYLE = Manual;
+CODE_SIGN_IDENTITY = "iPhone Developer";
+CODE_SIGN_STYLE = Automatic;
 DEVELOPMENT_TEAM = "";
 INFOPLIST_FILE = Example/Info.plist;
 LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";