Make module name and typings consistent

Change interface to use `printJS` both as an import as well
as on window object.

index.d.ts

@@ -3,33 +3,33 @@ import 'print-js/dist/print';
 declare type PrintTypes = 'pdf' | 'html' | 'image' | 'json';
 
 export interface Configuration {
-    printable: any;
-    fallbackPrintable?: string;
-    type?: PrintTypes;
-    documentTitle?: string;
-    header?: any;
-    headerStyle?: string;
-    maxWidth?: number;
-    font?: string;
-    font_size?: string;
-    honorMarginPadding?: boolean;
-    honorColor?: boolean;
-    targetStyle?: string | string[];
-    targetStyles?: string | string[];
-    properties?: any;
-    gridHeaderStyle?: string;
-    gridStyle?: string;
-    showModal?: boolean;
-    onLoadingStart?: () => void;
-    onLoadingEnd?: () => void;
-    modalMessage?: string;
-    frameId?: string;
-    ignoreElements?: string | string[];
-    imageStyle?: string;
-    repeatTableHeader?: boolean;
-    css?: string | string[];
-    style?: string;
-    scanStyles?: boolean;
+  printable: any;
+  fallbackPrintable?: string;
+  type?: PrintTypes;
+  documentTitle?: string;
+  header?: any;
+  headerStyle?: string;
+  maxWidth?: number;
+  font?: string;
+  font_size?: string;
+  honorMarginPadding?: boolean;
+  honorColor?: boolean;
+  targetStyle?: string | string[];
+  targetStyles?: string | string[];
+  properties?: any;
+  gridHeaderStyle?: string;
+  gridStyle?: string;
+  showModal?: boolean;
+  onLoadingStart?: () => void;
+  onLoadingEnd?: () => void;
+  modalMessage?: string;
+  frameId?: string;
+  ignoreElements?: string | string[];
+  imageStyle?: string;
+  repeatTableHeader?: boolean;
+  css?: string | string[];
+  style?: string;
+  scanStyles?: boolean;
 }
 
 declare var printJS: (params: string | Configuration) => void;

src/index.js

@@ -1,10 +1,10 @@
 import './sass/index.scss'
 import print from './js/init'
 
-const printjs = print.init
+const printJS = print.init
 
 if (typeof window !== 'undefined') {
-  window.printJS = printjs
+  window.printJS = printJS
 }
 
-export default printjs
+export default printJS

webpack.config.js

@@ -8,7 +8,7 @@ module.exports = {
     './src/index.js'
   ],
   output: {
-    library: 'printJs',
+    library: 'printJS',
     libraryTarget: 'umd',
     path: path.resolve(__dirname, 'dist'),
     filename: 'print.js',