Update linter plus related spacing fixes

lib/operation.js

@@ -332,7 +332,7 @@ function convolve (kernel) {
       !is.integer(kernel.width) || !is.integer(kernel.height) ||
       !is.inRange(kernel.width, 3, 1001) || !is.inRange(kernel.height, 3, 1001) ||
       kernel.height * kernel.width !== kernel.kernel.length
-     ) {
+  ) {
     // must pass in a kernel
     throw new Error('Invalid convolution kernel');
   }