Fixed problem with type casting (#513)

GaborWnuk · wkh237 · commit 4205ebc3d1d2 · 2017-09-12T09:40:45.000+08:00
Resulted in `errMsg = "task cancelled"` even though isCancelled was "0".
diff --git a/ios/RNFetchBlobNetwork.m b/ios/RNFetchBlobNetwork.m
@@ -505,7 +505,7 @@ - (void) URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCom
         errMsg = [error localizedDescription];
     }
     NSDictionary * taskSession = [taskTable objectForKey:taskId];
-    BOOL isCancelled = [taskSession valueForKey:@"isCancelled"];
+    BOOL isCancelled = [[taskSession valueForKey:@"isCancelled"] boolValue];
     if(isCancelled) {
         errMsg = @"task cancelled";
     }

Original file line number	Diff line number	Diff line change
`@@ -505,7 +505,7 @@ - (void) URLSession:(NSURLSession )session task:(NSURLSessionTask )task didCom`
`505`	`505`	`errMsg = [error localizedDescription];`
`506`	`506`	`}`
`507`	`507`	`NSDictionary * taskSession = [taskTable objectForKey:taskId];`
`508`		`- BOOL isCancelled = [taskSession valueForKey:@"isCancelled"];`
	`508`	`+ BOOL isCancelled = [[taskSession valueForKey:@"isCancelled"] boolValue];`
`509`	`509`	`if(isCancelled) {`
`510`	`510`	`errMsg = @"task cancelled";`
`511`	`511`	`}`