Fix mypy pre-commit hook on windows (#1081)

devtools/run-in-env.sh

@@ -1,3 +1,17 @@
-#!/bin/bash
-source $(poetry env info --path)/bin/activate
+#!/usr/bin/env bash
+
+OS_KERNEL=$(uname -s)
+OS_VER=$(uname -v)
+if  [[ ( $OS_KERNEL == "Linux" && $OS_VER == *"Microsoft"* ) ]]; then
+    echo "Pre-commit hook needs git-bash to run.  It cannot run in the windows linux subsystem."
+    echo "Add git bin directory to the front of your path variable, e.g:"
+    echo "set PATH=C:\Program Files\Git\bin;%PATH%"
+    exit 1
+fi
+if [[ "$(expr substr $OS_KERNEL 1 10)" == "MINGW64_NT" ]]; then
+    POETRY_PATH=$(poetry.exe env info --path)
+    source "$POETRY_PATH"\\Scripts\\activate
+else
+    source $(poetry env info --path)/bin/activate
+fi
 exec "$@"