Fixed babel warning

- specified corejs version in babelrc
- set line width in editorconfig
- added cleaning in webpack configuration

Author: high1

.babelrc

@@ -5,7 +5,8 @@
     [
       "@babel/preset-env",
       {
-        "useBuiltIns": "entry"
+        "useBuiltIns": "entry",
+        "corejs": "3.0.0"
       }
     ]
   ]

.editorconfig

@@ -5,7 +5,7 @@ indent_style = space
 indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
-max_line_length = 80
+max_line_length = 100
 
 [*.md]
 max_line_length=off

.prettierrc

@@ -1,4 +1,3 @@
 {
-  "singleQuote": true,
-  "printWidth": 100
+  "singleQuote": true
 }