Revert pip install editable change [ci] (#180)

Author: cdce8p

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ on:
   pull_request: ~
 
 env:
-  CACHE_VERSION: 2
+  CACHE_VERSION: 3
   DEFAULT_PYTHON: 3.8
   LIB_FOLDER: python_typing_update
   PRE_COMMIT_CACHE: ~/.cache/pre-commit
@@ -50,7 +50,7 @@ jobs:
           . venv/bin/activate
           python -m pip install -U pip setuptools wheel
           pip install -U -r requirements.txt -r requirements_test.txt
-          pip install .
+          pip install -e .
       - name: Generate pre-commit restore key
         id: generate-pre-commit-key
         run: >-
@@ -107,7 +107,6 @@ jobs:
       - name: Run formatting check
         run: |
           . venv/bin/activate
-          pip install -e .
           pre-commit run --all-files
 
   pylint:
@@ -137,7 +136,6 @@ jobs:
       - name: Run pylint
         run: |
           . venv/bin/activate
-          pip install -e .
           pylint ${{ env.LIB_FOLDER }} tests
 
   mypy:
@@ -207,7 +205,7 @@ jobs:
           . venv/bin/activate
           python -m pip install -U pip setuptools wheel
           pip install -U -r requirements.txt -r requirements_test.txt
-          pip install .
+          pip install -e .
       - name: Run pytest
         run: |
           . venv/bin/activate