Update doc

README.md

@@ -1,10 +1,11 @@
-### [Alfred Workflow](https://www.alfredapp.com/workflows/) to convert between multiple currencies 💱️
+### [Alfred Workflow](https://www.alfredapp.com/workflows/) to convert between multiple fiat and crypto currencies 💱️
 
 ![Currency Converter example](/img/example.png)
 
 
 * `CRYPTOS` env var is a comma separated list of crypto currencies (BTC, ETH, CRO, etc).
 * `FIATS` env var is a comma separated list of fiat currencies (USD, ARS, CZK, etc).
+* `COINMARKETCAP_APIKEY` is an key to use [coinmarketcap.com's api](https://coinmarketcap.com/api/) [OPTIONAL].
 
 ![Currency Converter vars](/img/vars.png)
 

info.plist

@@ -25,7 +25,7 @@
 	<key>createdby</key>
 	<string>Fede Calendino</string>
 	<key>description</key>
-	<string>Convert between multiple currencies 💱️</string>
+	<string>Convert between multiple fiat and crypto currencies 💱️</string>
 	<key>disabled</key>
 	<false/>
 	<key>name</key>

providers/crypto.py

@@ -6,11 +6,16 @@
 
 
 def fetch(currencies):
+    api_key = os.getenv("COINMARKETCAP_APIKEY")
+
+    if not api_key:
+        return {}
+
     currencies = set(map(lambda string: string.upper(), currencies))
 
     headers = {
         "Accept": "application/json",
-        "X-CMC_PRO_API_KEY": os.getenv("COINMARKETCAP_APIKEY"),
+        "X-CMC_PRO_API_KEY": api_key,
     }
 
     params = {