Use class name as Vue component's name

[hjkcai]

Just make it simple to give names to components

[hjkcai]

An error occurred when running npm test also fixed here.
Error details:

> vue-class-component@5.0.0 test /Users/hjkcai/Desktop/vue-class-component
> npm run build && webpack --config test/webpack.config.js && mocha test/test.build.js


> vue-class-component@5.0.0 build /Users/hjkcai/Desktop/vue-class-component
> npm run build:ts && npm run build:main


> vue-class-component@5.0.0 build:ts /Users/hjkcai/Desktop/vue-class-component
> tsc -p .


> vue-class-component@5.0.0 build:main /Users/hjkcai/Desktop/vue-class-component
> node build/build.js

dist/vue-class-component.js 4.13kb
dist/vue-class-component.min.js 1.80kb (gzipped: 0.86kb)
dist/vue-class-component.common.js 3.95kb
Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration.output.path: The provided value "./test" is not an absolute path!