Remove dynamic imports

lib/imsize/detector.js

@@ -4,7 +4,7 @@ var typeMap = {};
 var types = require('./types');
 
 types.forEach(function(type) {
-  typeMap[type] = require('./types/' + type).detect;
+  typeMap[type.extension] = type.module.detect;
 });
 
 module.exports = function(buffer, filepath) {

lib/imsize/index.js

@@ -8,7 +8,7 @@ var handlers = {};
 var types = require('./types');
 
 types.forEach(function(type) {
-  handlers[type] = require('./types/' + type);
+  handlers[type.extension] = type.module;
 });
 
 var MaxBufferSize = 128 * 1024;

lib/imsize/types.js

 'use strict';
 
 module.exports = [
-  'bmp',
-  'gif',
-  'jpg',
-  'png',
-  'tiff',
+  { extension: 'bmp', module: require('./types/bmp') },
+  { extension: 'gif', module: require('./types/gif') },
+  { extension: 'jpg', module: require('./types/jpg') },
+  { extension: 'png', module: require('./types/png') },
+  { extension: 'tiff', module: require('./types/tiff') }
 ];
+