Bump default ktfmt to 0.49.

Author: nedtwigg

lib/src/main/java/com/diffplug/spotless/kotlin/KtfmtStep.java

@@ -36,7 +36,7 @@
  */
 public class KtfmtStep implements java.io.Serializable {
 	private static final long serialVersionUID = 1L;
-	private static final String DEFAULT_VERSION = "0.47";
+	private static final String DEFAULT_VERSION = "0.49";
 	private static final String NAME = "ktfmt";
 	private static final String MAVEN_COORDINATE = "com.facebook:ktfmt:";