Updating dependencies to fix #68

[cbjuan]

Summary

As stated in the issue #68, the extension was raising an error when launching.
After some research, we understood that the error is related to package fsevents (only available for OSX). So we updated all the packages. Also, during the big update, we experience errors with https://github.com/mike-lischke/antlr4-c3 package and other things (security issues with Jest, etc.), but all of them seem to be solved.

Details and comments

Some links about the error in the case of #68:

• Extension host terminated unexpectedly in vs code insiders 1.31.0 microsoft/vscode#64981
• Node modules are looked up in global paths microsoft/vscode#68024
• Extension Host Crash microsoft/vscode-cordova#472.
• Extension host terminated unexpectedly in vs code insiders 1.31.0 microsoft/vscode#64981 (comment)
• https://github.com/Microsoft/vscode-cordova/pull/475/files

I tested this PR as follows:

• Launching the extension from the extension host process while developing
• Installing the extension manually from a VSIX package, launching it, and playing with some extension commands like executing Python code, etc.

Please, test it to be sure it works before releasing a new version.