`.vscodeignore` file should not ignore the whole `node_modules` folder

Hi,

I'm testing a locally built/packaged vsix file for this repo but I got "Cannot find module 'vscode-languageclient'" when the package is loaded/reloaded by vscode.

vscode-languageclient should be packaged into the vsix file as show below (referenced from some other issue):

I debugged into this issue really hard and found that the whole folder of node_modules is ignored by .vscodeignore file.

vscode-vlang/.vscodeignore

Line 3 in 441f50f

node_modules/

The released v0.1.14 package does not have the same issue. But in theory, the .vscodeignore file should not ignore the whole node_modules folder.

Again, this issue is reported from a local build, so it's just for anyone who is re-packaging the extension locally and has the error of 'vscode-languageclient'.