Fix flake8 line indexing (palantir#674)

Author: youben11

pyls/plugins/flake8_lint.py

@@ -81,11 +81,11 @@ def parse_report(document, report):
  'code': code,
  'range': {
  'start': {
- 'line': line,
+ 'line': line - 1,
  'character': character
  },
  'end': {
- 'line': line,
+ 'line': line - 1,
  # no way to determine the column
  'character': len(physical_line)
  }

test/plugins/test_flake8_lint.py

@@ -44,8 +44,8 @@ def test_flake8_lint(config):
 
  assert unused_var['source'] == 'flake8'
  assert unused_var['code'] == 'F841'
- assert unused_var['range']['start'] == {'line': 6, 'character': 1}
- assert unused_var['range']['end'] == {'line': 6, 'character': 11}
+ assert unused_var['range']['start'] == {'line': 5, 'character': 1}
+ assert unused_var['range']['end'] == {'line': 5, 'character': 11}
  assert unused_var['severity'] == lsp.DiagnosticSeverity.Warning
 
  finally: