feat: add support for html-webpack-plugin v4

BREAKING CHANGE: drop support for Webpack v3 and html-webpack-plugin v3

Author: simon04

README.md

@@ -227,6 +227,11 @@ If the webpack mode is set to `production` the favicons mode will use `webapp`.
 
 This behaviour can be adjusted by setting the favicon `mode` and `devMode` options.
 
+## Compatibility
+
+favicons-webpack-plugin 2.x is compatible with html-webpack-plugin 3.x
+favicons-webpack-plugin 3.x is compatible with html-webpack-plugin 4.x 
+
 ## Changelog
 
 Take a look at the [CHANGELOG.md](https://github.com/jantimon/favicons-webpack-plugin/tree/master/CHANGELOG.md).

appveyor.yml

@@ -1,16 +1,11 @@
 environment:
   nodejs_version: "Current"
 
-  matrix:
-  - TARGET: "webpack@3 html-webpack-plugin@2"
-  - TARGET: "webpack@4 html-webpack-plugin@3"
-
 install:
 - ps: Install-Product node $env:nodejs_version x64
 
 - appveyor-retry npm install -g npm@latest
 - appveyor-retry npm install
-- appveyor-retry npm install %TARGET%
 
 test_script:
 - appveyor-retry npm test