Fix pylint hang on file with many errors (#380)

Author: hetmankp

pylsp/plugins/pylint_lint.py

@@ -101,9 +101,7 @@ def lint(cls, document, is_saved, flags=''):  # pylint: disable=too-many-locals,
 
         with Popen(cmd, stdout=PIPE, stderr=PIPE,
                    cwd=cwd, universal_newlines=True) as process:
-            process.wait()
-            json_out = process.stdout.read()
-            err = process.stderr.read()
+            json_out, err = process.communicate()
 
         if err != '':
             log.error("Error calling pylint: '%s'", err)