Remove deprecated --all flag

.github/workflows/coverage.yml

@@ -5,7 +5,7 @@ on:
   pull_request:
     branches: [master]
 jobs:
-  lint:
+  codecov:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1

.github/workflows/main.yml

@@ -19,4 +19,4 @@ jobs:
         name: Run tests
         with:
           command: test
-          args: --all --locked
+          args: --locked

README.md

@@ -51,7 +51,7 @@ by adding the absolute path of the `target/debug` folder to your `PATH` environm
 TexLab has an extensive test suite of unit and integration tests. You can run them by executing
 
 ```shell
-cargo test --all
+cargo test
 ```
 
 in the project folder.