Update README.md

Author: barbatus

README.md

@@ -4,5 +4,5 @@ Exports two symbols:
   - `TypeScriptCompiler` - a compiler to be registered using `registerBuildPlugin` 
      to compile TypeScript files.
 
-  - `TypeScript' - an object with `compile` method.
+  - `TypeScript` - an object with `compile` method.
      Use `TypeScript.compile(source, options)` to compile with preset options.