Update Project.toml

Thanks to @giordano in #59.

Author: fhs

Project.toml

@@ -8,7 +8,8 @@ Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Zlib_jll = "83775a58-1f1d-513f-b197-d71354ab007a"
 
 [compat]
-julia = "≥ 1.3.0"
+Zlib_jll = "1.2.11"
+julia = "1.3.0"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"