Update to SDWebImage#732 to fix misspell (completion instead of completition)

Author: bpoplauschi

SDWebImage/SDImageCache.h

@@ -136,7 +136,7 @@ typedef void(^SDWebImageCheckCacheCompletionBlock)(BOOL isInCache);
  * @param key             The unique image cache key
  * @param completionBlock An block that should be executed after the image has been removed (optional)
  */
-- (void)removeImageForKey:(NSString *)key withCompletition:(void (^)())completion;
+- (void)removeImageForKey:(NSString *)key withCompletion:(void (^)())completion;
 
 /**
  * Remove the image from memory and optionally disk cache synchronously
@@ -153,7 +153,7 @@ typedef void(^SDWebImageCheckCacheCompletionBlock)(BOOL isInCache);
  * @param fromDisk        Also remove cache entry from disk if YES
  * @param completionBlock An block that should be executed after the image has been removed (optional)
  */
-- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk withCompletition:(void (^)())completion;
+- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(void (^)())completion;
 
 /**
  * Clear all memory cached images

SDWebImage/SDImageCache.m

@@ -316,18 +316,18 @@ - (NSOperation *)queryDiskCacheForKey:(NSString *)key done:(void (^)(UIImage *im
 }
 
 - (void)removeImageForKey:(NSString *)key {
-    [self removeImageForKey:key withCompletition:nil];
+    [self removeImageForKey:key withCompletion:nil];
 }
 
-- (void)removeImageForKey:(NSString *)key withCompletition:(void (^)())completion {
-    [self removeImageForKey:key fromDisk:YES withCompletition:completion];
+- (void)removeImageForKey:(NSString *)key withCompletion:(void (^)())completion {
+    [self removeImageForKey:key fromDisk:YES withCompletion:completion];
 }
 
 - (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk {
-    [self removeImageForKey:key fromDisk:fromDisk withCompletition:nil];
+    [self removeImageForKey:key fromDisk:fromDisk withCompletion:nil];
 }
 
-- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk withCompletition:(void (^)())completion {
+- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(void (^)())completion {
 
     if (key == nil) {
         return;