我想使用https://github.com/angular-google-chart/angular-google-chart/使用谷歌图表，但是当我想通过bower install angular-google-chart --save安装它时，我收到以下错误：
$ bower install angular-google-chart --save
bower angular-google-chart#* cached git://github.com/angular-google-chart/angular-google-chart.git#0.0.11
bower angular-google-chart#* validate 0.0.11 against git://github.com/angular-google-chart/angular-google-chart.git#*
bower angular#~1.2.9 cached git://github.com/angular/bower-angular.git#1.2.29
bower angular#~1.2.9 validate 1.2.29 against git://github.com/angular/bower-angular.git#~1.2.9
bower angular#1.4.7 cached git://github.com/angular/bower-angular.git#1.4.7
bower angular#1.4.7 validate 1.4.7 against git://github.com/angular/bower-angular.git#1.4.7
bower angular#^1.3.0 || >1.4.0-beta.0 cached git://github.com/angular/bower-angular.git#1.4.7
bower angular#^1.3.0 || >1.4.0-beta.0 validate 1.4.7 against git://github.com/angular/bower-angular.git#^1.3.0 || >1.4.0-beta.0
bower angular#>= 1.0.8 cached git://github.com/angular/bower-angular.git#1.4.7
bower angular#>= 1.0.8 validate 1.4.7 against git://github.com/angular/bower-angular.git#>= 1.0.8
bower angular#^1.4.0 cached git://github.com/angular/bower-angular.git#1.4.7
bower angular#^1.4.0 validate 1.4.7 against git://github.com/angular/bower-angular.git#^1.4.0
bower ECONFLICT Unable to find suitable version for angular