Remove old ruby versions

`Process::CLOCK_MONOTONIC` was implemented in ruby 2.1. ruby/ruby@93bb489
treasure-data · Jan 22, 2020 · 28b1abb · 28b1abb
1 parent 9c1112a
commit 28b1abb
Showing 1 changed file with 0 additions and 2 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,4 @@
 rvm:
-  - 1.9.3
-  - 2.0.0
   - 2.1.7
   - 2.2.3
   - 2.3.1