Update go-lsp to 0.1.2

[cmaglie]

Please check if the PR fulfills these requirements

• [X] The PR has no duplicates (please search among the Pull Requests before creating one)
• [X] The PR follows our contributing guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)

What kind of change does this PR introduce? Fix other LSP DocumentURI encodings problems.

What is the current behavior?

What is the new behavior?

Other information: See https://github.com/bugst/go-lsp/pull/2