ci: add github action badge.

diff --git a/README.md b/README.md
index 889f33b..d21d5dd 100644
--- a/README.md
+++ b/README.md

@@ -1,7 +1,7 @@
 # Casbin Spring Boot Starter
 
 [![Codecov branch](https://img.shields.io/codecov/c/github/jcasbin/casbin-spring-boot-starter/master.svg?logo=codecov&style=flat-square)](https://codecov.io/gh/jcasbin/casbin-spring-boot-starter)
-[![Build Status](https://img.shields.io/travis/com/jcasbin/casbin-spring-boot-starter/master.svg?style=flat-square)](https://travis-ci.com/jcasbin/casbin-spring-boot-starter)
+[![GitHub Actions](https://github.com/jcasbin/casbin-spring-boot-starter/workflows/build/badge.svg)](https://github.com/jcasbin/casbin-spring-boot-starter/actions)
 [![Maven Central](https://img.shields.io/maven-central/v/org.casbin/casbin-spring-boot-starter.svg?style=flat-square&color=brightgreen)](https://maven-badges.herokuapp.com/maven-central/org.casbin/casbin-spring-boot-starter/)
 [![Bintray](https://img.shields.io/bintray/v/casbin/maven/casbin-spring-boot-starter.svg?style=flat-square&color=blue)](https://bintray.com/casbin/maven/casbin-spring-boot-starter/_latestVersion)
 [![License](https://img.shields.io/github/license/jcasbin/casbin-spring-boot-starter.svg?style=flat-square&color=blue)](http://www.apache.org/licenses/LICENSE-2.0.txt)

diff --git a/build.gradle b/build.gradle
index 0783251..f32e7b0 100644
--- a/build.gradle
+++ b/build.gradle

@@ -6,7 +6,6 @@
 
 apply plugin: 'io.spring.dependency-management'
 apply from: "maven.gradle"
-apply from: "travis.gradle"
 apply from: "bintray.gradle"
 apply from: "jacoco.gradle"
 

diff --git a/travis.gradle b/travis.gradle
deleted file mode 100644
index 8ca412d..0000000
--- a/travis.gradle
+++ /dev/null

@@ -1,45 +0,0 @@
-import groovy.json.JsonBuilder
-
-def packageDir = "${GROUP.replace('.', '/')}/${ARTIFACT_ID}"
-
-task writeDescriptor {
-    def builder = new JsonBuilder()
-    def root = builder {
-        'package' {
-            name ARTIFACT_ID
-            repo 'maven'
-            subject BINTRAY_SUBJECT
-            desc POM_DESCRIPTION
-            website_url POM_URL
-            issue_tracker_url ISSUE_URL
-            vcs_url GIT_URL
-            github_use_tag_release_notes true
-            github_release_notes_file 'README.md'
-            licenses POM_LICENCE_NAME
-//            labels 'labels'
-            public_download_numbers true
-        }
-        'version' {
-            name VERSION_CODE
-            desc POM_DESCRIPTION
-            released new Date().format('yyyy-MM-dd')
-            vcs_tag VERSION_CODE
-            gpgSign true
-        }
-        publish true
-    }
-    root.files = []
-    root.files.add([
-            'includePattern': 'build/libs/(.*\\.(jar|pom))',
-            'uploadPattern' : "$packageDir/$VERSION_CODE/\$1",
-            'matrixParams'  : [
-                    'override': 1
-            ]
-    ])
-
-    def jsonFile = new File("$buildDir/descriptor.json")
-    if (!jsonFile.parentFile.exists()) jsonFile.parentFile.mkdirs()
-    jsonFile.write(builder.toPrettyString())
-}
-
-build.dependsOn('writeDescriptor')