Rename calendar component

app.js

 import { createStackNavigator } from 'react-navigation'
 import Home from './home'
 import TemperatureList from './list'
-import Datepicker from './datepicker'
+import Calendar from './calendar'
 import DayView from './day-view'
 import Bleeding from './bleeding'
 
 export default createStackNavigator({
   home: { screen: Home },
   temperatureList: { screen: TemperatureList },
-  datepicker: { screen: Datepicker },
+  calendar: { screen: Calendar },
   dayView: { screen: DayView },
   bleeding: { screen: Bleeding }
 })
\ No newline at end of file

home.js

@@ -22,7 +22,7 @@ export default class Home extends Component {
           title="Edit symptoms for today">
         </Button>
         <Button
-          onPress={() => navigate('datepicker')}
+          onPress={() => navigate('calendar')}
           title="Go to calendar">
         </Button>
       </View>