Typo fix for export name (#120)

* Fix typo in exported function name
* Export incorrect name for backward compatibility

Author: Brent Schroeter

src/utils/index.js

@@ -36,7 +36,8 @@ export {default as isReactCreateClassCall} from './isReactCreateClassCall';
 export {default as isReactModuleName} from './isReactModuleName';
 export {default as isStatelessComponent} from './isStatelessComponent';
 export {default as match} from './match';
-export {default as normalizeClassDefiniton} from './normalizeClassDefinition';
+export {default as normalizeClassDefinition} from './normalizeClassDefinition';
+export {default as normalizeClassDefiniton} from './normalizeClassDefinition'; // backward compatibility
 export {default as printValue} from './printValue';
 export {default as resolveExportDeclaration} from './resolveExportDeclaration';
 export {default as resolveToModule} from './resolveToModule';