Bump scala compiler to 2.12.14 (close #200)

Author: istreeter

build.sbt

@@ -42,7 +42,7 @@ lazy val buildSettings = Seq(
   organization := "com.snowplowanalytics",
   name := "snowplow-elasticsearch-loader",
   description := "Load the contents of a Kinesis stream or NSQ topic to Elasticsearch",
-  scalaVersion := "2.12.10",
+  scalaVersion := "2.12.14",
   scalacOptions := BuildSettings.compilerOptions,
   javacOptions := BuildSettings.javaCompilerOptions,
   resolvers += Resolver.jcenterRepo,