Updated Vim version in Dockerfile and made UpdateTagStack clearer

The `settagstack` and `gettagstack` functions don't exist prior to Vim
8.1.0519.  And the function definition was unclear whether it intended
  to grab the *old* or the *new* file/line/col.

1 files changed, 1 insertions, 1 deletions

diff --git a/Dockerfile b/Dockerfile
index 6111f9ba..58ab0771 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM tweekmonster/vim-testbed:latest
 
 RUN install_vim -tag v8.0.0027 -build \
-                -tag v8.1.0204 -build \
+                -tag v8.1.0519 -build \
                 -tag neovim:v0.2.0 -build \
                 -tag neovim:v0.3.0 -build