julia 1.3 is the oldest version that can build ZMQ.jl now

docs/source/faq.rst

@@ -55,10 +55,10 @@ We **strongly** recommend specifying a Python version (in environment.yml, runti
 Julia
 ~~~~~
 
-All Julia versions since Julia 0.7.0 are supported via a :ref:`Project.toml <Project.toml>`
+All Julia versions since Julia 1.3 are supported via a :ref:`Project.toml <Project.toml>`
 file, and this is the recommended way to install Julia environments.
 
-The older Julia REQUIRE file is no longer supported because required infrastructure has been removed.
+Julia < 1.3 and the older Julia REQUIRE file is no longer supported because required infrastructure has been removed.
 
 R
 ~

tests/julia/project-binder-dir/.binder/Project.toml

@@ -2,4 +2,4 @@
 IteratorInterfaceExtensions = "82899510-4779-5014-852e-03e436cf321d"
 
 [compat]
-julia = "=1.0.2"
+julia = "=1.3"

tests/julia/project-binder-dir/verify

@@ -1,7 +1,7 @@
 #!/usr/bin/env julia
 
-if VERSION != v"1.0.2"
-    println("Julia version should be 1.0.2")
+if VERSION != v"1.3.1"
+    println("Julia version should be 1.3.1")
     exit(1)
 end