[bug?] global is not defined

[roytan883]

Hi, i try to use WatermelonDB in electron on windows. But I got this error:

Uncaught ReferenceError: global is not defined
    at index.js:15
    at Object../node_modules/@nozbe/watermelondb/utils/common/devMeasureTime/index.js (index.js:22)

after I modify this file:

node_modules/@nozbe/watermelondb/utils/common/devMeasureTime/index.js

//if (global && global.nativePerformanceNow) {
if ('undefined' !== typeof global && global.nativePerformanceNow) {

it works.

[radex]

@roytan883 great, send a pull request!