Add Ruby 3.x to CI testing

Author: tatethurston

.travis.yml

@@ -8,6 +8,8 @@ rvm:
   - 2.5
   - 2.6
   - 2.7
+  - 3.0
+  - 3.1
   - jruby-9.0.5.0
 jdk:
   - openjdk8

Gemfile.lock

@@ -59,6 +59,7 @@ GEM
     rake (13.0.1)
     rake-compiler (0.9.5)
       rake
+    rbtree (0.4.6)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -84,16 +85,16 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
+    set (1.1.0)
     simplecov (0.11.2)
       docile (~> 1.1.0)
       json (~> 1.8)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.0)
-    snappy (0.0.14)
-    snappy (0.0.14-java)
-      snappy-jars (~> 1.1.0)
-    snappy-jars (1.1.0.1.2-java)
-    thor (0.19.1)
+    sorted_set (1.0.3)
+      rbtree
+      set (~> 1.0)
+    sorted_set (1.0.3-java)
     unicode-display_width (1.3.0)
     yard (0.9.20)
 

cassandra-driver.gemspec

@@ -31,6 +31,7 @@ Gem::Specification.new do |s|
   end
 
   s.add_runtime_dependency 'ione', '~> 1.2'
+  s.add_runtime_dependency 'sorted_set', '~> 1.0'
 
   s.add_development_dependency 'bundler', '~> 1.6'
   s.add_development_dependency 'rake', '~> 13.0'