Fix output parser when golangci-lint errors in /dev/stderr

When a GOROOT file like `GOROOT/src/time/time.go` is analyzed, the
linter errors because some linters like “nolint” are unable to create
the AST cache. The errors are sent to /dev/stderr in non-JSON format
which makes it impossible for the SublimeLinter plugin to parse. Because
of this, I have opted to silence these warnings.

Author: cixtor

linter.py

@@ -2,7 +2,7 @@
 import json
 import logging
 import tempfile
-from SublimeLinter.lint import NodeLinter
+from SublimeLinter.lint import NodeLinter, util
 from SublimeLinter.lint.linter import LintMatch
 from SublimeLinter.lint.persist import settings
 
@@ -41,6 +41,7 @@ class Golangcilint(NodeLinter):
     # | 1.4565s | gosec       |
     cmd = "golangci-lint run --fast --out-format json"
     defaults = {"selector": "source.go"}
+    error_stream = util.STREAM_STDOUT
     line_col_base = (1, 1)
 
     def run(self, cmd, code):