add comment why packer's version is hardcoded

As of writing there is no 'latest' (hashicorp/packer/issues/5265)

1 files changed, 1 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
index 4dd6fcc..d698deb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ env:
   matrix:
   - DIST=trusty
   global:
+    # 20170821: as of writing there is no 'latest' (hashicorp/packer/issues/5265)
   - PACKER_ZIP="packer_1.0.4_linux_amd64.zip"
   - PACKER_URL="https://releases.hashicorp.com/packer/1.0.4/packer_1.0.4_linux_amd64.zip"