Add missing semicolon in Readme

Author: lumaxis

README.md

@@ -90,7 +90,7 @@ From our experience, 3rd-party libraries usually reside inside a subdirectory (l
 2. Add the following line at the top of the file below your own `import` statements:
 
     ```objectivec
-    @import HockeySDK
+    @import HockeySDK;
     ```
 
 3. Search for the method `applicationDidFinishLaunching:`