Add drone runner

.drone.yml

@@ -1,24 +1,16 @@
 kind: pipeline
-type: docker
-name: default
+  name: default
 
 steps:
 - name: test
-  image: rust:1.40
+  image: rust:1.61
   commands:
-    - apt update
-    - apt install -y libsdl2-dev libsdl2-gfx-dev
-    - cargo check --verbose --all
-    - cargo test --verbose --all
-
+  - apt update
+  - apt install -y libsdl2-dev libsdl2-gfx-dev libsdl2-mixer-dev cmake
+  - cargo check --verbose --all
+  - cargo test --verbose --all
 - name: rustfmt
-  image: rust:1.40
+  image: rust:1.61
   commands:
-    - rustup component add rustfmt
-    - cargo fmt --all -- --check
-
-- name: clippy
-  image: rust:1.40
-  commands:
-    - rustup component add clippy
-    - cargo clippy --all
+  - rustup component add rustfmt
+  - cargo fmt --all -- --check