Update to latest Boot and add some gitignores

.gitignore

@@ -2,6 +2,8 @@ target/*
 .settings/*
 .classpath
 .project
+.factorypath
+.attach_pid*
 .idea
 *.iml
 /target

pom.xml

@@ -10,7 +10,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.1.2.RELEASE</version>
+    <version>2.1.3.RELEASE</version>
   </parent>
   <name>petclinic</name>