Drop beta columns because of rust-lang/rust#66518

Author: qryxip

.github/workflows/ci.yml

@@ -104,10 +104,11 @@ jobs:
           - stable-x86_64-pc-windows-gnu
           - stable-x86_64-apple-darwin
           - stable-x86_64-unknown-linux-gnu
-          - beta-x86_64-pc-windows-msvc
-          - beta-x86_64-pc-windows-gnu
-          - beta-x86_64-apple-darwin
-          - beta-x86_64-unknown-linux-gnu
+          # https://github.com/rust-lang/rust/issues/66518
+          # - beta-x86_64-pc-windows-msvc
+          # - beta-x86_64-pc-windows-gnu
+          # - beta-x86_64-apple-darwin
+          # - beta-x86_64-unknown-linux-gnu
         include:
           - toolchain: 1.38.0-x86_64-pc-windows-msvc
             features: --no-default-features
@@ -141,22 +142,22 @@ jobs:
             features: --all-features
             dep_tests: true
             os: ubuntu-18.04
-          - toolchain: beta-x86_64-pc-windows-msvc
-            features: --no-default-features
-            dep_tests: true
-            os: windows-latest
-          - toolchain: beta-x86_64-pc-windows-gnu
-            features: --no-default-features
-            dep_tests: false
-            os: windows-latest
-          - toolchain: beta-x86_64-apple-darwin
-            features: --all-features
-            dep_tests: true
-            os: macOS-latest
-          - toolchain: beta-x86_64-unknown-linux-gnu
-            features: --all-features
-            dep_tests: true
-            os: ubuntu-18.04
+          # - toolchain: beta-x86_64-pc-windows-msvc
+          #   features: --no-default-features
+          #   dep_tests: true
+          #   os: windows-latest
+          # - toolchain: beta-x86_64-pc-windows-gnu
+          #   features: --no-default-features
+          #   dep_tests: false
+          #   os: windows-latest
+          # - toolchain: beta-x86_64-apple-darwin
+          #   features: --all-features
+          #   dep_tests: true
+          #   os: macOS-latest
+          # - toolchain: beta-x86_64-unknown-linux-gnu
+          #   features: --all-features
+          #   dep_tests: true
+          #   os: ubuntu-18.04
 
     name: ${{ matrix.toolchain }}
     runs-on: ${{ matrix.os }}