Require a minimum of Julia 1.3

For `findfirst(::Char, ::AbstractString)`.

Author: timholy

.github/workflows/CI.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.0'
+          - '1.3'
           - '1.6'
           - 'nightly'
         os:

Project.toml

@@ -4,7 +4,7 @@ authors = ["Tim Holy <[email protected]> and contributors"]
 version = "0.1.0"
 
 [compat]
-julia = "1"
+julia = "1.3"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"