Fix babel handling for node: DEFAULT_ENGINES

[lbguilherme]

If bundling anything with --target=node, the following error will be thrown:

🚨  Error: Invalid version passed for target "node": ">= 6.0.0". Versions must be in semver format (major.minor.patch)
    at /home/guilherme/Cubos/zak-api/node_modules/babel-preset-env/lib/index.js:69:13
    at Array.filter (<anonymous>)
    at isPluginRequired (/home/guilherme/Cubos/zak-api/node_modules/babel-preset-env/lib/index.js:59:54)
    at filterItem (/home/guilherme/Cubos/zak-api/node_modules/babel-preset-env/lib/index.js:99:20)
    at Array.filter (<anonymous>)
    at Object.buildPreset [as default] (/home/guilherme/Cubos/zak-api/node_modules/babel-preset-env/lib/index.js:149:56)
    at getEnvPlugins (/home/guilherme/Cubos/zak-api/node_modules/parcel-bundler/src/transforms/babel.js:250:34)
    at getEnvConfig (/home/guilherme/Cubos/zak-api/node_modules/parcel-bundler/src/transforms/babel.js:217:25)

For node, specifying >= 6 is wrong, it should say just 6.

If possible, please release 1.6.2 with this fix, otherwise targeting node won't work

[lbguilherme]

Workaround: Add this to your package.json:

  "engines": {
    "node": "6"
  },

[codecov-io]

Codecov Report

Merging #827 into master will increase coverage by 0.56%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #827      +/-   ##
==========================================
+ Coverage   91.27%   91.84%   +0.56%     
==========================================
  Files          68       68              
  Lines        3555     3727     +172     
==========================================
+ Hits         3245     3423     +178     
+ Misses        310      304       -6

Impacted Files	Coverage Δ
src/utils/getTargetEngines.js	98.79% <ø> (+0.06%)	⬆️
src/assets/RustAsset.js	91.81% <0%> (-4.11%)	⬇️
src/assets/TOMLAsset.js	100% <0%> (ø)	⬆️
src/assets/YAMLAsset.js	100% <0%> (ø)	⬆️
src/transforms/babel.js	96.66% <0%> (+0.17%)	⬆️
src/transforms/uglify.js	95.83% <0%> (+0.18%)	⬆️
src/assets/JSAsset.js	96.21% <0%> (+0.41%)	⬆️
src/visitors/dependencies.js	92.95% <0%> (+0.53%)	⬆️
src/assets/TypeScriptAsset.js	97.5% <0%> (+0.62%)	⬆️
... and 8 more

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