Merge pull request #3 from jiro4989/patch-2

Fix undefined variables

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
         uses: actions/cache@v1
         with:
           path: ~/.choosenim
-          key: ${{ runner.os }}-choosenim-${{ env.NIM_VERSION }}
+          key: ${{ runner.os }}-choosenim-${{ matrix.nim_version }}
       - name: Cache nimble
         id: cache-nimble
         uses: actions/cache@v1
@@ -78,4 +78,4 @@ jobs:
           (cd tests && nim c test22.nim)
           (cd tests && nim c test23.nim)
           (cd tests && nim c test24.nim)
-        shell: bash
+        shell: bash