[rb] update changelog for 4.5
[rb] update changelog for 4.5

valfirst/selenium,titusfortner/selenium,titusfortner/selenium,joshmgrant/selenium,valfirst/selenium,titusfortner/selenium,joshmgrant/selenium,titusfortner/selenium,titusfortner/selenium,SeleniumHQ/selenium,valfirst/selenium,joshmgrant/selenium,SeleniumHQ/selenium,valfirst/selenium,joshmgrant/selenium,SeleniumHQ/selenium,valfirst/selenium,titusfortner/selenium,joshmgrant/selenium,SeleniumHQ/selenium,titusfortner/selenium,titusfortner/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,joshmgrant/selenium,valfirst/selenium,SeleniumHQ/selenium,valfirst/selenium,SeleniumHQ/selenium,valfirst/selenium,SeleniumHQ/selenium,joshmgrant/selenium,joshmgrant/selenium,joshmgrant/selenium,valfirst/selenium,joshmgrant/selenium,SeleniumHQ/selenium,titusfortner/selenium,valfirst/selenium,valfirst/selenium,SeleniumHQ/selenium,titusfortner/selenium,titusfortner/selenium,joshmgrant/selenium