bump ruby-progressbar

CHANGELOG.md

@@ -15,6 +15,7 @@ Bugs:
 Chores:
 * Switched to `require_relative` internally throughout the codebase to be more pry-friendly (#130)
 * Rewrote the entire API doc and placed it on [squib.readthedocs.org](http://squib.readthedocs.org). :tada:
+* Bumped dependency ruby-progressbar to 1.8.
 
 Compatibility:
 * Upgraded Cairo from 1.14.3 to 1.15.2. With this change, Squib no longer supports Ruby <= 2.1.

squib.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'roo', '~> 2.3.0'
   spec.add_runtime_dependency 'rsvg2', '~> 3.0.0'
   spec.add_runtime_dependency 'mercenary', '~> 0.3.4'
-  spec.add_runtime_dependency 'ruby-progressbar', '~> 1.6'
+  spec.add_runtime_dependency 'ruby-progressbar', '~> 1.8'
 
   spec.add_development_dependency 'bundler', '~> 1.6'
   spec.add_development_dependency 'rake'