Switch to Kotlin version 1.3.70

Summary: One of the more fragile solutions for dealing with comments is failing on Maven builds, but not on other builds. This may be due to a difference in the Kotlin Compiler version. Bumping it up to 1.3.70 for consistency.

Reviewed By: cgrushko

Differential Revision: D21019891

fbshipit-source-id: d52e51c9cd43eb4d2033604ca401a217221a6e1c

core/pom.xml

@@ -13,7 +13,7 @@
 
     <properties>
         <dokka.version>0.10.1</dokka.version>
-        <kotlin.version>1.3.50</kotlin.version>
+        <kotlin.version>1.3.70</kotlin.version>
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>
         <main.class>com.facebook.ktfmt.MainKt</main.class>