Update license.txt

license.txt

@@ -10,7 +10,8 @@ third-party solver libraries.
 idaes-lib-<platform>.tar.gz
 ===========================
 
-  cubic_root.so, functions.so, iapws95_external.so, and swco2_external.so
+  cubic_root.so, functions.so, iapws95_external.so, general_helmholtz.so,
+  and swco2_external.so
   -----------------------------------------------------------------------
   License: IDAES BSD 3-clause,
            https://github.com/IDAES/idaes-pse/blob/master/LICENSE.md
@@ -102,7 +103,6 @@ idaes-solvers-<platform>.tar.gz
   Source: https://gcc.gnu.org/
 
 
-
   MinGW
   -----
   For Windows, MinGW runtime libraries are included.
@@ -130,6 +130,15 @@ idaes-solvers-<platform>.tar.gz
   action of contract, negligence or other tortious action, arising out
   of or in connection with the use or performance of this software.
 
+
+  ADOL-C
+  ------
+
+  Source: https://github.com/coin-or/ADOL-C
+  License: ECLIPSE PUBLIC LICENSE VERSION 1.0
+           https://github.com/coin-or/ADOL-C/blob/master/LICENSE
+
+
 idaes-petsc-<platform>.tar.gz
 ===============================