Bump pygments from 2.7.3 to 2.7.4 in /examples

Bumps [pygments](https://github.com/pygments/pygments) from 2.7.3 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](https://github.com/pygments/pygments/compare/2.7.3...2.7.4)

Signed-off-by: dependabot[bot] <support@github.com>

examples/Pipfile.lock

@@ -395,11 +395,10 @@
         },
         "pygments": {
             "hashes": [
-                "sha256:ccf3acacf3782cbed4a989426012f1c535c9a90d3a7fc3f16d231b9372d2b716",
+                "sha256:bc9591213a8f0e0ca1a5e68a479b4887fdc3e75d0774e5c71c31920c427de435",
-                "sha256:f275b6c0909e5dafd2d6269a656aa90fa58ebf4a74f8fcf9053195d226b24a08"
+                "sha256:df49d09b498e83c1a73128295860250b0b7edd4c723a32e9bc0d295c7c2ec337"
             ],
-            "markers": "python_version >= '3.5'",
+            "version": "==2.7.4"
-            "version": "==2.7.3"
         },
         "pyparsing": {
             "hashes": [