Bump commit we're based on.

JulienPalard · JulienPalard · commit 56f46d27c2a3 · 2018-11-29T18:34:06.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,4 +8,4 @@ install:
   - pospell --version
 script:
   - pospell -p dict -l fr_FR **/*.po
-  - make CPYTHON_CLONE=/tmp/cpython/ COMMIT=d4ed8809dd
+  - make CPYTHON_CLONE=/tmp/cpython/ COMMIT=1659c08d5d
