updated currency endpoint (#44)

Author: nikhila05

README.rst

@@ -32,7 +32,7 @@ Features:
 Currency Source:
 -----------------
 
-https://ratesapi.io/api/ is a free API for current and historical foreign exchange rates published by European Central Bank.
+https://ratesapi.io is a free API for current and historical foreign exchange rates published by European Central Bank.
 The rates are updated daily 3PM CET.
 
 BitCoin Price Source:

docs/source/currencysource.rst

@@ -1,9 +1,9 @@
 currency source
 ===============
 
-https://ratesapi.io/api/
+https://ratesapi.io
 --------
-https://ratesapi.io/api/ is a free API for current and historical foreign exchange rates published by European Central Bank. The rates are updated daily 3PM CET.
+https://ratesapi.io is a free API for current and historical foreign exchange rates published by European Central Bank. The rates are updated daily 3PM CET.
 
 List of Supported Currency codes.
 ---------------------------------

forex_python/converter.py

@@ -6,7 +6,7 @@
 
 class RatesNotAvailableError(Exception):
     """
-    Custome Exception when https://ratesapi.io/api/ is Down are not available for currency rates
+    Custome Exception when https://ratesapi.io is Down and not available for currency rates
     """
     pass