Update notebooks

examples/notebook/linear_solver/integer_programming_example.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "##### Copyright 2020 The OR-Tools Authors."
+    "##### Copyright 2020 Google LLC."
    ]
   },
   {
@@ -81,7 +81,6 @@
     "# limitations under the License.\n",
     "\"\"\"Small example to illustrate solving a MIP problem.\"\"\"\n",
     "# [START program]\n",
-    "from __future__ import print_function\n",
     "# [START import]\n",
     "from ortools.linear_solver import pywraplp\n",
     "# [END import]\n",