Allow lints of pest grammar terminals

Terminals such as EOI and WHITESPACE are objected to by clippy.

Author: glyn

Diff for: .github/workflows/quickstart.yml

@@ -85,4 +85,4 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: -- -D warnings
+          args: -- -D warnings -A clippy::upper-case-acronyms