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Upgrade error

See original GitHub issue

Hello! I try update backstopjs to 3.2 version and get next:

$ npm update  -g backstopjs
/usr/local/bin/backstop -> /usr/local/lib/node_modules/backstopjs/cli/index.js

> puppeteer@1.4.0 install /usr/local/lib/node_modules/backstopjs/node_modules/puppeteer
> node install.js

Downloading Chromium r555668 - 76.4 Mb [====================] 100% 0.0s 
Chromium downloaded to /usr/local/lib/node_modules/backstopjs/node_modules/puppeteer/.local-chromium/mac-555668
npm WARN ajv-keywords@3.2.0 requires a peer of ajv@^6.0.0 but none is installed. You must install peer dependencies yourself.

+ backstopjs@3.2.16
added 15 packages from 12 contributors, removed 2 packages and updated 8 packages in 65.926s
Andrews-Mini:Cart Krawchuk$ backstop test
/usr/local/lib/node_modules/backstopjs/core/util/runPuppet.js:39
async function processScenarioView (scenario, variantOrScenarioLabelSafe, scenarioLabelSafe, viewport, config) {
      ^^^^^^^^
SyntaxError: Unexpected token function
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/usr/local/lib/node_modules/backstopjs/core/util/createBitmaps.js:10:17)

Also after updating of Canary elder version of backstopjs doesn’t work.