Remove config refreshing wrapper

See libgit2/libgit2#2638.

Author: jspahrsummers

ObjectiveGit/GTConfiguration.h

@@ -42,12 +42,4 @@
 
 - (BOOL)deleteValueForKey:(NSString *)key error:(NSError **)error;
 
-/// Reloads the configuration from the files on disk if they have changed since
-/// it was originally loaded.
-///
-/// error - The error if one occurred.
-///
-/// Returns whether the refresh was successful.
-- (BOOL)refresh:(NSError **)error;
-
 @end

ObjectiveGit/GTConfiguration.m

@@ -140,17 +140,4 @@ - (NSArray *)remotes {
 	return remotes;
 }
 
-#pragma mark Refresh
-
-- (BOOL)refresh:(NSError **)error {
-	int success = git_config_refresh(self.git_config);
-	if (success != GIT_OK) {
-		if (error != NULL) *error = [NSError git_errorFor:success description:@"Couldn't reload the configuration from disk."];
-
-		return NO;
-	}
-
-	return YES;
-}
-
 @end

ObjectiveGitTests/GTSubmoduleSpec.m

@@ -253,15 +253,12 @@
 
 		NSString *configKey = @"submodule.Test_App2.url";
 		NSString *newOrigin = @"https://github.com/libgit2/objective-git.git";
-		[config setString:newOrigin forKey:configKey];
 
-		expect(@([config refresh:NULL])).to(beTruthy());
+		[config setString:newOrigin forKey:configKey];
 		expect([config stringForKey:configKey]).to(equal(newOrigin));
 
 		__block NSError *error = nil;
 		expect(@([submodule sync:&error])).to(beTruthy());
-
-		expect(@([config refresh:NULL])).to(beTruthy());
 		expect([config stringForKey:configKey]).to(equal(@"../Test_App"));
 	});
 });