Handle sqlite3 as a scheme on Conf::GlobalSettings::Database#from_url

spec/marten/conf/global_settings/database_spec.cr

@@ -543,6 +543,13 @@ describe Marten::Conf::GlobalSettings::Database do
       db_config_1.name.should eq "marten.db"
     end
 
+    it "parses sqlite url that starts with sqlite3" do
+      db_config_1 = Marten::Conf::GlobalSettings::Database.new("default")
+      db_config_1.from_url "sqlite3://marten.db"
+      db_config_1.backend.should eq "sqlite"
+      db_config_1.name.should eq "marten.db"
+    end
+
     it "parses a postgres url" do
       db_config_1 = Marten::Conf::GlobalSettings::Database.new("default")
       db_config_1.from_url "postgres://username:password@martenframework.com:25/db"

src/marten/conf/global_settings/database.cr

@@ -95,19 +95,19 @@ module Marten
         def from_url(url : String)
           # URI.parse cant parse 'sqlite://:memory:'
           if url.starts_with? "sqlite://:memory:"
-            self.backend = "sqlite"
+            self.backend = DB::Connection::SQLITE_ID
             self.name = ":memory:"
             return
           end
 
           uri = URI.parse url
 
-          self.backend = uri.scheme
+          self.backend = uri.scheme == "sqlite3" ? DB::Connection::SQLITE_ID : uri.scheme
           self.host = uri.host
           self.port = uri.port
           self.user = uri.user
           self.password = uri.password
-          self.name = uri.scheme == "sqlite" ? uri.host : uri.path[1..]?
+          self.name = @backend == DB::Connection::SQLITE_ID ? uri.host : uri.path[1..]?
 
           params_map = uri.query_params.to_h