DOC: readme update (#431)

Co-authored-by: JHM Darbyshire (M1) <[email protected]>

README.md

@@ -18,12 +18,6 @@
 Its purpose is to provide advanced, flexible and efficient fixed income analysis
 with a high level, well documented API.
 
-Its design objective is to be able to create a self-consistent, arbitrage free
-framework for pricing all aspects of fixed income trading, such as spot FX, FX forwards,
-single currency securities and derivatives like fixed rate bonds and IRSs, and also
-multi-currency derivatives such as FX swaps and cross-currency swaps. Options,
-swaptions and inflation are also under consideration for future development.
-
 The techniques and object interaction within *rateslib* were inspired by
 the requirements of multi-disciplined fixed income teams working, both cooperatively
 and independently, within global investment banks.
@@ -40,7 +34,7 @@ Get Started
 ===========
 
 Read the documentation at 
-[Rateslib Read-the-Docs](https://rateslib.readthedocs.io/en/stable/)
+[Rateslib Read-the-Docs](https://rateslib.readthedocs.io/en/latest/)