Bump version to dev version 0.1.9000

Change-Id: I8db2b3ab4e00f57596ab44d81616ef48490bc554
diff --git a/.Rbuildignore b/.Rbuildignore
index 0c1c641..21ae968 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -2,3 +2,4 @@
 ^\.Rproj\.user$
 LICENSE.md
 Readme.md
+Changelog.md