Update julia

Changes:

- https://github.com/docker-library/julia/commit/473f2e4: Merge pull request https://github.com/docker-library/julia/pull/33 from J0WI/buster
- https://github.com/docker-library/julia/commit/1c1bfc5: Add Debian Buster variants
- https://github.com/docker-library/julia/commit/2736a02: Update generated README

library/julia

@@ -1,12 +1,17 @@
-# this file is generated via https://github.com/docker-library/julia/blob/56a09f211ead57236aaedff59c61de3ed81fea72/generate-stackbrew-library.sh
+# this file is generated via https://github.com/docker-library/julia/blob/1c1bfc53b104b73332954b1544adb53d52a190fa/generate-stackbrew-library.sh
 
 Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/julia.git
 
-Tags: 1.1.1-stretch, 1.1-stretch, 1-stretch, stretch
+Tags: 1.1.1-buster, 1.1-buster, 1-buster, buster
 SharedTags: 1.1.1, 1.1, 1, latest
 Architectures: amd64, arm64v8, i386
+GitCommit: 1c1bfc53b104b73332954b1544adb53d52a190fa
+Directory: 1.1/buster
+
+Tags: 1.1.1-stretch, 1.1-stretch, 1-stretch, stretch
+Architectures: amd64, arm64v8, i386
 GitCommit: 36c40cb93c8ca5c717ab7395a775f5683f176e97
 Directory: 1.1/stretch
 
@@ -24,9 +29,14 @@ GitCommit: 36c40cb93c8ca5c717ab7395a775f5683f176e97
 Directory: 1.1/windows/windowsservercore-1803
 Constraints: windowsservercore-1803
 
-Tags: 1.0.4-stretch, 1.0-stretch
+Tags: 1.0.4-buster, 1.0-buster
 SharedTags: 1.0.4, 1.0
 Architectures: amd64, arm32v7, arm64v8, i386
+GitCommit: 1c1bfc53b104b73332954b1544adb53d52a190fa
+Directory: 1.0/buster
+
+Tags: 1.0.4-stretch, 1.0-stretch
+Architectures: amd64, arm32v7, arm64v8, i386
 GitCommit: 092cb514a9994ee61ae883f53d56ea03c89a3c0c
 Directory: 1.0/stretch