Fix GitLab CI script and Readme

Change-Id: If26f1dd886867ef977f5ad4629d864e81714f900
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 24d366d..7845f56 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,10 +17,10 @@
 build:
   stage: build
   script:
-    - ./gradlew --build-cache build
+    - ./gradlew --build-cache shadowJar
   artifacts:
     paths:
-      - app/build/libs/korapxml2conllu.jar
+      - app/build/libs/korapxmltool.jar
   cache:
     key: "$CI_COMMIT_REF_NAME"
     policy: push