Fix bench build bug, added CI lints

In order to auto-catch bugs and code quality,
adding clippy and fmt to CI (same as geo)

.github/workflows/test.yml

@@ -21,7 +21,10 @@ jobs:
           toolchain: stable
           profile: minimal
           override: true
-          components: rustfmt, rust-src
+          components: rustfmt, clippy, rust-src
       - name: Checkout repository
         uses: actions/checkout@v2
-      - run: cargo test --all-features && cargo test --no-default-features
+      - run: cargo fmt --all -- --check
+      - run: cargo clippy --all-features --all-targets -- -Dwarnings
+      - run: cargo test --all-features
+      - run: cargo test --no-default-features

benches/parse.rs

@@ -2,6 +2,8 @@
 extern crate criterion;
 extern crate wkt;
 
+use std::str::FromStr;
+
 fn criterion_benchmark(c: &mut criterion::Criterion) {
     c.bench_function("parse small", |bencher| {
         let s = include_str!("./small.wkt");