new satpy version to fix #27 - error when gridded file prefix is > 2...

new satpy version to fix #27 - error when gridded file prefix is > 2 characters and tiles are generated

buildbucket/buildbucket_environment.yaml

@@ -27,4 +27,4 @@ dependencies:
     - git+https://github.com/deeplycloudy/lmatools.git@minvaluegrids
     - git+https://github.com/deeplycloudy/stormdrain.git
     - git+https://github.com/deeplycloudy/glmtools.git@master
-    - git+https://github.com/pytroll/satpy.git@3544d60940dba9129499ac3ee303c0705a9ddf7b
\ No newline at end of file
+    - git+https://github.com/pytroll/satpy.git@d556c806e2b66e5ac1c5b0613c6290edfeb43b92
\ No newline at end of file