Add compat entries to standard libraries (#71)

* chore: add standard library compats to Project.toml

* loosen a bit

* fix compats

Author: mortenpi

Project.toml

@@ -16,9 +16,14 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
 [compat]
 AbstractTrees = "0.3,0.4"
+Base64 = "<0.0.1, 1"
+Markdown = "<0.0.1,1"
+REPL = "<0.0.1, 1"
 ReplMaker = "0.2"
 ResourceContexts = "0.1,0.2"
-TOML = "1"
+SHA = "<0.0.1, 0.7, 1"
+TOML = "<0.0.1, 1"
+UUIDs = "<0.0.1, 1"
 julia = "1.5"
 
 [extras]