LSP diagnostics ranges can't be empty (fixes #92)

subp.check_call was failing, now logging it with check_output

Added coverage upload to CI

Workaround for pygls throwing RuntimeErrors during tests

Fix path to updated vsim Docker version

Silencing curl output when uploading coverage on AppVeyor

Powershell seems to treat curl's stdout as error. Reference:
https://community.codecov.io/t/bash-uploader-returns-error-code-on-appveyor/1682/15

Tweaked trigger to suggest using a config file (fixes #77)

Handling git not being installed (fixes #72)

Fixed corner cases when checking for latest version (closes #63)

Handling escaped Verilog identifiers