just run cargo test

.travis.yml

@@ -4,7 +4,7 @@ dist: trusty
 addons:
   apt:
     packages:
-      - libssl-dev
+       libssl-dev
 cache: cargo
 env:
   - ELEFREN_FEATURES="--features toml"
@@ -20,8 +20,7 @@ before_script:
 script:
   - |
     if [[ "$TRAVIS_RUST_VERSION" == "nightly"* ]]; then cargo fmt --all -- --check; fi
-  - cargo clean && cargo build $ELEFREN_FEATURES
-  - cargo clean && cargo test --features all
+  - cargo test $ELEFREN_FEATURES
 after_success: |
   if [[ "$TRAVIS_RUST_VERSION" == stable ]]; then
     RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install cargo-tarpaulin