bump version and history for new version

Author: pchtsp

HISTORY

@@ -4,7 +4,9 @@
 # See the LICENSE file for copyright information.
 2.7.0
     added HiGHS solver
-    added pysmps dependency for mps parsing
+    added XPRESS_PY solver
+    fixed bugs
+    updated docs
 2.6.0 2021-12-04
     dropped packaged choco
     fixed bugs

pulp/constants.py

@@ -27,7 +27,7 @@
 This file contains the constant definitions for PuLP
 Note that hopefully these will be changed into something more pythonic
 """
-VERSION = "2.6.0"
+VERSION = "2.7.0"
 EPS = 1e-7
 
 # variable categories