Make lineFeed event lowercase

Fixes #1159

src/InputHandler.ts

@@ -134,9 +134,9 @@ export class InputHandler implements IInputHandler {
     /**
      * This event is emitted whenever the terminal outputs a LF or NL.
      *
-     * @event lineFeed
+     * @event linefeed
      */
-    this._terminal.emit('lineFeed');
+    this._terminal.emit('linefeed');
   }
 
   /**

src/addons/winptyCompat/winptyCompat.ts

@@ -41,7 +41,7 @@ declare var define: any;
     // space. This is certainly not without its problems, but generally on
     // Windows when text reaches the end of the terminal it's likely going to be
     // wrapped.
-    this.on('lineFeed', () => {
+    this.on('linefeed', () => {
       const line = this.buffer.lines.get(this.buffer.ybase + this.buffer.y - 1);
       const lastChar = line[this.cols - 1];
       if (lastChar[3] !== 32 /* ' ' */) {