Fix typo: evenything -> everything

Author: delirious-lettuce

tests/test_inputstream.py

@@ -83,7 +83,7 @@ def test_flush_1(processor, stream):
 
 def test_flush_2(processor, stream):
  # Send left key with a 'Flush' in between.
- # The flush should make sure that we process evenything before as-is,
+ # The flush should make sure that we process everything before as-is,
  # with makes the first part just an escape character instead.
  stream.feed('\x1b')
  stream.flush()