Added jruby to the Travis yml file

Author: zoras

.travis.yml

@@ -10,6 +10,7 @@ rvm:
   - 2.1
   - 2.2
   - 2.3.1
+  - jruby-9.1.2.0
 addons:
   code_climate:
     repo_token: 05e3e31164d59aa626b730b92eb9b7418326dbf23420a4b87eab2555840b39ef

suture.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  sqlite3 = if defined? JRUBY_VERSION
+  sqlite3 = if RUBY_PLATFORM =~ /java/i
               "activerecord-jdbcsqlite3-adapter"
             else
               "sqlite3"