Fix variable name

Fixes #27.

Author: TheAssassin

README.md

@@ -41,6 +41,6 @@ linuxdeploy-plugin-appimage can be configured using environment variables.
 - `LDAI_OUTPUT=filename`: change filename of resulting AppImage
 - `LDAI_RUNTIME_FILE`: path to custom AppImage runtime appimagetool should use
 - `LDAI_NO_APPSTREAM=1`: skip checking AppStream metadata for issues
-- `LDAI_APPIMAGE_COMP=...`: compression algorithm appimagetool/mksquashfs should use (e.g., `xz`, `gzip`), see [appimagetool's repository](https://github.com/AppImage/AppImageKit/) for more information
+- `LDAI_COMP=...`: compression algorithm appimagetool/mksquashfs should use (e.g., `xz`, `gzip`), see [appimagetool's repository](https://github.com/AppImage/AppImageKit/) for more information
 - `LINUXDEPLOY_OUTPUT_APP_NAME`: sets `APPIMAGETOOL_APP_NAME` to configure appimagetool's autogenerated filename prefix
 - `LINUXDEPLOY_OUTPUT_VERSION` or `LDAI_VERSION`: version number to pass to appimagetool (will be included in the root desktop file to be picked up by desktop integration tools and, if `$LDAI_OUTPUT` is not set, will be included in appimagetool's autogenerated output filename)