Update the ESLint dependencies, and also tweak the no-multiple-empty-lines rules

Since multiple empty lines is virtually unused in the code-base, and the few cases that do exist look like "typos", let's enforce greater consistency here; please see https://eslint.org/docs/rules/no-multiple-empty-lines.

src/display/webgl.js

@@ -219,7 +219,6 @@ var WebGLUtils = (function WebGLUtilsClosure() {
     var texture = createTexture(gl, layer, gl.TEXTURE0);
     var maskTexture = createTexture(gl, mask, gl.TEXTURE1);
 
-
     // Create a buffer and put a single clipspace rectangle in
     // it (2 triangles)
     var buffer = gl.createBuffer();