bump Scala versions (2.12.14, 2.13.6) (#270)

Author: SethTisue

.travis.yml

@@ -5,8 +5,8 @@ import: scala/scala-dev:travis/default.yml
 language: scala
 
 scala:
-  - 2.12.13
-  - 2.13.5
+  - 2.12.14
+  - 2.13.6
 
 env:
   - ADOPTOPENJDK=8

README.md

@@ -34,7 +34,7 @@ to match your project’s Scala binary version):
 <dependency>
   <groupId>org.scala-lang</groupId>
   <artifactId>scala-reflect</artifactId>
-  <version>2.13.5</version>
+  <version>2.13.6</version>
   <scope>provided</scope>
 </dependency>
 ```