紙ツールバーポリマー2.0

Question

におけるポリマー2.0を使用しているとき、私は紙のツールバーをインストールすると、私はいつもPolymerCLI

Unable to find a suitable version for polymer, please choose one by typing one of the numbers below: 
1) polymer#^1.2.0 which resolved to 1.8.1 and is required by paper-toolbar#1.1.7 
2) polymer#^1.1.0 which resolved to 1.8.1 and is required by iron-flex-layout#1.3.2 
3) polymer#^1.0.0 which resolved to 1.8.1 and is required by paper-styles#1.2.0 
4) polymer#^2.0.0-rc.2 which resolved to 2.0.0-rc.2 and is required by Pokedex 
5) polymer#^2.0.0-rc.1 which resolved to 2.0.0-rc.2 and is required by iron-component-page#9bcd9558d7 

Prefix the choice with ! to persist it to bower.json 


? Answer 

Answer 1

でこれを取得する：

bower install --save PolymerElements/paper-button#2.0-preview