Merge pull request #4 from danielribeiro/readme-syntax-highlight

Updating readme's syntax highlight

README.md

@@ -27,7 +27,7 @@ Or manually checkout the submodule with `git submodule add git@github.com:Square
 
 ### Basic Initialization
 
-```
+```objc
 VALValet *myValet = [[VALValet alloc] initWithIdentifier:@"Druidia" accessibility:VALAccessibilityWhenUnlocked];
 ```
 
@@ -44,7 +44,7 @@ The VALAccessibility enum is used to determine when your secrets can be accessed
 
 ### Reading and Writing
 
-```
+```objc
 NSString *const username = @"Skroob";
 [myValet setString:@"12345" forKey:username];
 NSString *const myLuggageCombination = [myValet stringForKey:username];
@@ -62,15 +62,15 @@ This instance can be used to store and retrieve data securely across any app wri
 
 ### Sharing Secrets Across Devices with iCloud
 
-```
+```objc
 VALSynchronizableValet *mySynchronizableValet = [[VALSynchronizableValet alloc] initWithIdentifier:@"Druidia" accessibility:VALAccessibilityWhenUnlocked];
 ```
 
 This instance can be used to store and retrieve data that can be retrieved by this app on other devices logged into the same iCloud account with iCloud Keychain enabled. `mySynchronizableValet` can not read or modify values in `myValet` or `mySharedValet` because `mySynchronizableValet` is of a different class type. If iCloud Keychain is not enabled on this device, secrets can still be read and written, but will not sync to other devices.
 
 ### Protecting Secrets with Touch ID or iOS Passcode
 
-```
+```objc
 VALSecureEnclaveValet *mySecureEnclaveValet = [[VALSecureEnclaveValet alloc] initWithIdentifier:@"Druidia"];
 ```