Update istanbul to version 0.4.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

istanbul just published its new version 0.4.3, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of istanbul – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 16 commits .

• fc3ba35 0.4.3
• b3de106 Update changelog, contributors
• bb5b6e1 Merge pull request #579 from jtangelder/fix-colors
• 0411600 return plain string when an invalid clazz is given
• a556a5e Merge pull request #552 from abejfehr/patch-1
• 369ed49 Merge pull request #545 from pra85/patch-1
• 4d2daef correct ansi colors for 16 colors environments
• 8a05237 Remove double semicolon from CSS rule
• f17cb56 Fix a typo
• ad8ab1d Merge pull request #528 from doowb/handlebars
• dd81378 Create new instance of Handlebars.
• 743912d Merge pull request #520 from adamjmcgrath/escodegen-1.8.x
• 048b4b3 Merge pull request #506 from steve-gray/master
• 200c448 Update escodegen
• 8b64df0 Simple test for testing if code parses. Does require that escodegen does not choke on input. Works fine with modified escodegen.

There are 16 commits in total. See the full diff.

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[coveralls]

Coverage remained the same at 93.103% when pulling ea0fda5cad4504c52b77ca5d14c8e3c578e0b7f9 on greenkeeper-istanbul-0.4.3 into b2af5cf0d3f75b5fdff4025851789121164762e4 on master.