0.7.0

Changelog:

• Update scss-symbols-parser to 1.1.3 (fix issue with external URLs – #46)
• Require VS Code 1.12.0+
• Target Travis CI to Node.js 7+
• Don't stop the search even with the error (#39, #42, #46)
• Try to find partial files when we search imported file (#39, #42, #46)
• Warm up cache when rename action
• Update VSCode Language Server to the latest version (best performance)