fix a few spelling errors

found via `pre-commit  try-repo https://github.com/codespell-project/codespell --all-files`

CHANGELOG.md

@@ -1108,7 +1108,7 @@ that have helped us get this far!
 0.18.1 - 2017-09-04
 ===================
 - Only mention locking when waiting for a lock.
-- Fix `IOError` during locking in timeout situtation on windows under python 2.
+- Fix `IOError` during locking in timeout situation on windows under python 2.
 
 0.18.0 - 2017-09-02
 ===================

pre_commit/languages/conda.py

@@ -77,7 +77,7 @@ def run_hook(
         color: bool,
 ) -> Tuple[int, bytes]:
     # TODO: Some rare commands need to be run using `conda run` but mostly we
-    #       can run them withot which is much quicker and produces a better
+    #       can run them without which is much quicker and produces a better
     #       output.
     # cmd = ('conda', 'run', '-p', env_dir) + hook.cmd
     with in_env(hook.prefix, hook.language_version):

tests/xargs_test.py

@@ -160,7 +160,7 @@ def test_xargs_concurrency():
     assert ret == 0
     pids = stdout.splitlines()
     assert len(pids) == 5
-    # It would take 0.5*5=2.5 seconds ot run all of these in serial, so if it
+    # It would take 0.5*5=2.5 seconds to run all of these in serial, so if it
     # takes less, they must have run concurrently.
     assert elapsed < 2.5