how to change .ccls-cache dir for YCM

[deeplee]

Here are some things you should try before filing a bug report:

• For client issues related to emacs-ccls or vscode-ccls, report in their own repository.
• For build problems, check https://github.com/MaskRay/ccls/wiki/Build
• Check https://github.com/MaskRay/ccls/wiki/Debugging
• Check the FAQ to see if your issue is mentioned.

If none of those help, remove this section and fill out the four sections in the template below.

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Observed behavior

Describe what happened. Any aids you can include (that you think could be relevant) are a tremendous help.

• compile_commands.json or .ccls (wiki/Project-Setup)
• Reduce to A minimal set of .c .cc .h .hh files that can still demonstrate the issue.
• Consider a screencast gif.

Expected behavior

Describe what you expected to happen.

Steps to reproduce

1. Select these example steps,
2. Delete them,
3. And replace them with precise steps to reproduce your issue.

System information

• ccls version (git describe --tags --long):
• clang version:
• OS:
• Editor:
• Language client (and version):