💚 Update CI to use Stable Toolchain (#88)

* Update pr.yml

* remove +nightly in the commands now that we're using stable

.github/workflows/pr.yml

@@ -54,12 +54,12 @@ jobs:
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: nightly
+          toolchain: stable
           components: clippy
 
       - name: Run clippy
         # use nightly toolchain so that we get all the latest linter features
-        run: cargo +nightly clippy --tests -- -D warnings
+        run: cargo clippy --tests -- -D warnings
 
   format:
     name: Format
@@ -71,12 +71,12 @@ jobs:
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: nightly
+          toolchain: stable
           components: rustfmt
 
       - name: Run format
         # use nightly toolchain so that we get all the latest formatting features
-        run: cargo +nightly fmt --check
+        run: cargo fmt --check
 
   schema:
     name: Schema
@@ -88,12 +88,12 @@ jobs:
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: nightly
+          toolchain: stable
 
       - name: Run schema diff check
         # use nightly toolchain so that we get all the latest formatting features
         run: |
-          cargo +nightly run --package skip-api-entry-point --bin schema     
+          cargo run --package skip-api-entry-point --bin schema     
           if [[ `git status --porcelain` ]]; then
             echo "Schema is different, please run make schema"
             exit 1