Update Testing.yaml

Author: yebai

.github/workflows/Testing.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        julia-version: ['1.0.5', '1.1.1', '1.2.0', '1.3.0', 'nightly']
+        julia-version: ['1.0.5', '1.1.1', '1.2.0', '1.3.0', '1.4.0']
         julia-arch: [x64, x86]
         os: [ubuntu-latest, windows-latest, macOS-latest]
         exclude: