Update hylang to use `.hy` instead of `.py` ;)

hylang/README-content.md

@@ -22,4 +22,4 @@ Then build and run the docker image.
 
 For many single file projects, it may not be convenient to write a `Dockerfile` for your project. In such cases, you can run a hylang script by using the hylang docker image directly.
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10.0 hy your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10.0 hy your-daemon-or-script.hy

hylang/README.md

@@ -22,7 +22,7 @@ Then build and run the docker image.
 
 For many single file projects, it may not be convenient to write a `Dockerfile` for your project. In such cases, you can run a hylang script by using the hylang docker image directly.
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10.0 hy your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10.0 hy your-daemon-or-script.hy
 
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