Remove cflinuxfs2 from the stacks

- Add buildpack.toml to gitignore

Co-authored-by: David Freilich <dfreilich@pivotal.io>

Author: Zander Mackie

.gitignore

@@ -3,4 +3,5 @@
 .idea
 .bin
 yarn-cnb_*
-bin
+bin
+buildpack.toml

buildpack.toml.tmpl

@@ -17,7 +17,7 @@ name = "Yarn"
 sha256 = "df202627d9a70cf09ef2fb11cb298cb619db1b958590959d6f6e571b50656029"
 source = "https://github.com/yarnpkg/yarn/releases/download/v1.16.0/yarn-v1.16.0.tar.gz"
 source_sha256 = "df202627d9a70cf09ef2fb11cb298cb619db1b958590959d6f6e571b50656029"
-stacks = ["org.cloudfoundry.stacks.cflinuxfs2","org.cloudfoundry.stacks.cflinuxfs3","io.buildpacks.stacks.bionic"]
+stacks = ["org.cloudfoundry.stacks.cflinuxfs3","io.buildpacks.stacks.bionic"]
 uri = "https://buildpacks.cloudfoundry.org/dependencies/yarn/yarn-1.16.0-any-stack-df202627.tar.gz"
 version = "1.16.0"