整理pom

pom.xml

@@ -33,6 +33,8 @@
         <commons-io.version>2.6</commons-io.version>
         <slf4j.version>1.7.25</slf4j.version>
         <mybatis-plus.version>3.3.2</mybatis-plus.version>
+        <knife4j.version>3.0.2</knife4j.version>
+        <tx.version>5.2.12.RELEASE</tx.version>
     </properties>
     <dependencies>
         <dependency>
@@ -136,7 +138,7 @@
         <dependency>
             <groupId>com.github.xiaoymin</groupId>
             <artifactId>knife4j-spring-boot-starter</artifactId>
-            <version>3.0.2</version>
+            <version>${knife4j.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -176,7 +178,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-tx</artifactId>
-            <version>5.2.12.RELEASE</version>
+            <version>${tx.version}</version>
         </dependency>
     </dependencies>