add currency convert screenshot

README.md

@@ -18,6 +18,8 @@ The interface is inspired by [`htop`](https://en.wikipedia.org/wiki/Htop) and sh
 
 <img src="https://user-images.githubusercontent.com/168240/39569662-bcbdbcc0-4e7a-11e8-8a8f-8ff45868a8ae.png" alt="help menu" width="880" />
 
+<img src="https://user-images.githubusercontent.com/168240/39691066-1e29c18e-5191-11e8-87a2-9b1f4e1a1b4f.png" alt="currency convert menu" width="600" />
+
 In action
 
 <img src="https://user-images.githubusercontent.com/168240/39569570-75b1547c-4e7a-11e8-8eac-552abaa431f0.gif" alt="screencast" width="880" />

pkg/api/cmc/cmc.go

@@ -55,7 +55,7 @@ func getLimitedCoinData(convert string, offset int) (map[string]apitypes.Coin, e
 func (s *Service) GetAllCoinData(convert string) (map[string]apitypes.Coin, error) {
 	var wg sync.WaitGroup
 	ret := make(map[string]apitypes.Coin)
-	for i := 0; i < 10; i++ {
+	for i := 0; i < 5; i++ {
 		wg.Add(1)
 		go func(j int) {
 			coins, err := getLimitedCoinData(convert, j)