Fix typo in README.md (#1229)

Author: inokawa

README.md

@@ -318,7 +318,7 @@ module.exports = {
 |------|--------------|
 | `boolean` | `false`|
 
-If you're using [HappyPack](https://github.com/amireh/happypack) or [thread-loader](https://github.com/webpack-contrib/thread-loader) to parallise your builds then you'll need to set this to `true`. This implicitly sets `*transpileOnly*` to `true` and **WARNING!** stops registering **_all_** errors to webpack.
+If you're using [HappyPack](https://github.com/amireh/happypack) or [thread-loader](https://github.com/webpack-contrib/thread-loader) to parallelise your builds then you'll need to set this to `true`. This implicitly sets `*transpileOnly*` to `true` and **WARNING!** stops registering **_all_** errors to webpack.
 
 It's advisable to use this with the [fork-ts-checker-webpack-plugin](https://github.com/Realytics/fork-ts-checker-webpack-plugin) to get full type checking again. To see what this looks like in practice then either take a look at [our simple thread-loader example](examples/thread-loader). **_IMPORTANT_**: If you are using fork-ts-checker-webpack-plugin alongside HappyPack or thread-loader then ensure you set the `syntactic` diagnostic option like so: