Allow update pi versioning (#159)

* tweak versioning of selenium-webdriver

* update changelog

Author: KazuCocoa

CHANGELOG.md

@@ -4,6 +4,7 @@ Read `release_notes.md` for commit level details.
 
 ## [Unreleased]
 ### Enhancements
+- Allow selenium update following Pi versioning like 3.141.0
 - [internal] Update dev libraries
 
 ### Bug fixes

appium_lib_core.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'selenium-webdriver', '~> 3.14.1'
+  spec.add_runtime_dependency 'selenium-webdriver', '~> 3.14', '>= 3.14.1'
   spec.add_runtime_dependency 'faye-websocket', '~> 0.10.0'
 
   spec.add_development_dependency 'bundler', '~> 1.14'