Use jsonb as json type in migrations on SQLite 3.45+

This doesn't actually matter except for documentation purposes,
because SQLite doesn't treat json and jsonb differently.

While here, have MySQL use the json type when testing in CI.

Author: jeremyevans

README.rdoc

@@ -474,7 +474,9 @@ Note that these migrations require Sequel 4.35.0+.
       json_type = case database_type
       when :postgres
         :jsonb
-      when :sqlite, :mysql
+      when :sqlite
+        sqlite_version >= 34500 ? :jsonb : :json
+      when :mysql
         :json
       else
         String

spec/migrate/001_tables.rb

@@ -44,7 +44,9 @@
     json_type = case database_type
     when :postgres
       :jsonb
-    when :sqlite, :mysql
+    when :sqlite
+      sqlite_version >= 34500 ? :jsonb : :json
+    when :mysql
       :json
     else
       String

spec/migrate_ci/001_tables.rb

@@ -53,6 +53,8 @@
     when :postgres
       :jsonb
     when :sqlite
+      sqlite_version >= 34500 ? :jsonb : :json
+    when :mysql
       :json
     else
       String