Extend the insecure random rule with more insecure random functions

Signed-off-by: Cosmin Cojocar <cosmin.cojocar@gmx.ch>

helpers.go

@@ -37,7 +37,6 @@ import (
 // 	node, matched := MatchCallByPackage(n, ctx, "math/rand", "Read")
 //
 func MatchCallByPackage(n ast.Node, c *Context, pkg string, names ...string) (*ast.CallExpr, bool) {
-
 	importedName, found := GetImportedName(pkg, c)
 	if !found {
 		return nil, false