Add mypy to list of pre-commit hooks (#80)

.pre-commit-config.yaml

@@ -1,29 +1,33 @@
 repos:
-- repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v3.4.0
-  hooks:
-  - id: trailing-whitespace
-  - id: no-commit-to-branch
-    args: [--branch, main]
-- repo: https://github.com/psf/black
-  rev: 20.8b1
-  hooks:
-  - id: black
-- repo: https://github.com/PyCQA/flake8
-  rev: 3.8.4
-  hooks:
-  - id: flake8
-- repo: https://github.com/PyCQA/isort
-  rev: 5.7.0
-  hooks:
-  - id: isort
-- repo: https://github.com/PyCQA/pydocstyle
-  rev: 5.1.1
-  hooks:
-  - id: pydocstyle
-    exclude: (.*/)?test_.*\.py
-- repo: https://github.com/adrienverge/yamllint
-  rev: v1.26.0
-  hooks:
-  - id: yamllint
-    args: [-c, .yamllint.yaml, .]
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0
+    hooks:
+      - id: trailing-whitespace
+      - id: no-commit-to-branch
+        args: [--branch, main]
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.8.4
+    hooks:
+      - id: flake8
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.7.0
+    hooks:
+      - id: isort
+  - repo: https://github.com/PyCQA/pydocstyle
+    rev: 5.1.1
+    hooks:
+      - id: pydocstyle
+        exclude: (.*/)?test_.*\.py
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.812
+    hooks:
+      - id: mypy
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.26.0
+    hooks:
+      - id: yamllint
+        args: [-c, .yamllint.yaml, .]