fix(typings.d.ts): added apply method type to HtmlWwbpackPlugin class definitoin
fix(typings.d.ts): added apply method type to HtmlWwbpackPlugin class definitoin

jantimon#1244

jantimon/html-webpack-plugin,jantimon/html-webpack-plugin,ampedandwired/html-webpack-plugin,ampedandwired/html-webpack-plugin