Removed unused import and updated README.md

Author: jaehyukchoi

pkg/DESCRIPTION

@@ -16,7 +16,6 @@ LazyData: true
 RoxygenNote: 7.1.1
 Imports: 
   stats,
-  statmod,
-  devtools
+  statmod
 Suggests: 
   testthat (>= 3.0.0)

pkg/README.md

@@ -1,13 +1,8 @@
-# FE-R
-Financial Engineering functions in R
+# FER
+Financial Engineering in R
 
 ## Contents
-* Black-Scholes option pricing model: price and implied volatility
-* Bachelier option pricing model: price and implied volatility
-
-## Installation
-Install `devtools` package in run
-```R
-library(devtools)
-devtools::install_github("PyFE/FE-R", subdir="pkg")
-```
+* Black-Scholes model: option price and implied volatility
+* Bachelier model: option price and implied volatility
+* Constant-Elasticity-of-Variance (CEV) model: option price
+* Stochastic-Alpha-Beta-Rho (SABR) model: equivalent BS volatility and price