License switch to GLP (>=2)

Author: jaehyukchoi

pkg/DESCRIPTION

@@ -1,5 +1,5 @@
 Package: FER
-Title: Financial Engineering (FE) functions in R
+Title: Financial Engineering in R (FER)
 Version: 0.91
 Authors@R: person("Jaehyuk", "Choi", email = "[email protected]", role = c("aut", "cre"))
 Description: R implementations of standard financial engineering codes;
@@ -10,7 +10,7 @@ BugReports: https://github.com/PyFE/FE-R/issues
 Depends:
     R (>= 3.3.1)
 NeedsCompilation: no
-License: MIT + file LICENSE
+License: GPL (>= 2)
 Encoding: UTF-8
 LazyData: true
 RoxygenNote: 7.1.1