There is no color formatting for .rhtml files

[fwzmhmd]

• VSCode Version: Code 1.12.2 (19222cd, 2017-05-10T13:16:25.899Z)
• OS Version: Linux x64 4.4.0-78-generic
• Extensions:

Extension	Author	Version
material-icon-theme	PKief	2.0.8
vscode-icons	robertohuertasm	7.8.1

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Steps to Reproduce:

[jens1o]

I had created a pr. which should fix it.