precommit: enable codespell (#291)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.pre-commit-config.yaml

@@ -4,6 +4,11 @@ repos:
     hooks:
       - id: end-of-file-fixer
       - id: trailing-whitespace
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.5
+    hooks:
+      - id: codespell
+        #args: ["--write-changes"] # uncomment if you want to get automatic fixing
   - repo: https://github.com/myint/docformatter
     rev: v1.7.5
     hooks:

CHANGES.md

@@ -79,13 +79,13 @@
   > - Dropped support for python [3.3]{.title-ref} and added support for python [3.7]{.title-ref} and [3.8]{.title-ref}
 
 - Another problem with older version was that tests setup was convoluted and involved loading packages pickled from one
-  env into the current env (in which tests are run). Moreover there was no separation between unit tests and integration
-  tests (flaky)
+  env into the current env (in which tests are run). Moreover, there was no separation between unit tests and
+  integration tests (flaky)
 
   > - Tests have been separated into 2 suites (1) unit tests that totally rely on mock objects and run on every commit (
   >   travis.ci) and (2) end-to-end tests that need to be run manually.
-  > - The test setup for end-to-end tests has been greatly simplified although the \"flakyness\"\" still remains because
-  >   these tests are run against unpinned versions of [pip]{.title-ref}. However this is by design because we want to
+  > - The test setup for end-to-end tests has been greatly simplified although the \"flakiness\" still remains because
+  >   these tests are run against unpinned versions of [pip]{.title-ref}. However, this is by design because we want to
   >   know when [pipdeptree]{.title-ref} fails with a new version of [pip]{.title-ref}.
 
 - Move continuous integration from Travis to Github Actions.