issue#229 update CHANGELOG.md/README.md due to select/selected methods changes

Author: Mifrill

CHANGELOG.md

@@ -13,8 +13,8 @@ a block with this page, after which the page is closed.
 - `Ferrum::Browser` supports new option `:proxy` https://github.com/rubycdp/ferrum#proxy
 - `Ferrum::Network::Response#params` attr_reader added
 - `Ferrum::Node`
-  - `#selected` check selected option
-  - `#select` select option
+  - `#selected` checks selected options. Returns an array of `Ferrum::Node` that's selected.
+  - `#select` selects options by passed attribute, default: `:value`.
   - `#computed_style` returns hash of computed styles
 - `Ferrum::JavaScriptError#stack_trace` attr_reader
 - Windows support

README.md

@@ -1101,6 +1101,20 @@ frame.at_css("//a[text() = 'Log in']") # => Node
 #### selected : `Array<Node>`
 #### select
 
+(chainable) Selects options by passed attribute.
+
+```ruby
+browser.at_xpath("//*[select]").select(["1"]) # => Node (select)
+browser.at_xpath("//*[select]").select(["text"], by: :text) # => Node (select)
+```
+
+Accept string, array or strings:
+```ruby
+browser.at_xpath("//*[select]").select("1")
+browser.at_xpath("//*[select]").select("1", "2")
+browser.at_xpath("//*[select]").select(["1", "2"])
+```
+
 
 ## Thread safety ##