Standardize CI action (#62)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 34a090a..ced2b7d 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -21,7 +21,7 @@
         sdk: [dev]
     steps:
     - uses: actions/checkout@v2
-    - uses: dart-lang/setup-dart@v1
+    - uses: dart-lang/setup-dart@v1.0
       with:
         sdk: ${{ matrix.sdk }}
     - id: install
@@ -44,7 +44,7 @@
         sdk: [2.12.0, dev]
     steps:
     - uses: actions/checkout@v2
-    - uses: dart-lang/setup-dart@v1
+    - uses: dart-lang/setup-dart@v1.0
       with:
         sdk: ${{ matrix.sdk }}
     - id: install