travis-ci: update Git-LFS and P4 to the latest version

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.travis.yml

@@ -22,8 +22,8 @@ addons:
 env:
   global:
     - DEVELOPER=1
-    - P4_VERSION="15.2"
+    - P4_VERSION="16.1"
-    - GIT_LFS_VERSION="1.1.0"
+    - GIT_LFS_VERSION="1.2.0"
     - DEFAULT_TEST_TARGET=prove
     - GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
     - GIT_TEST_OPTS="--verbose --tee"