Support TextMate as an editor

[challet]

Hello,

This add Textmate (https://macromates.com/) to the editors list. Its line argument format was already present but not the process name to actually call it :

create-react-app/packages/react-dev-utils/launchEditor.js

Lines 153 to 156 in 0f6fc2b

	case 'rmate':
	case 'mate':
	case 'mine':
	return ['--line', lineNumber, fileName];

Tested on MacOS 10.13.6.

[stale]

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[challet]

up