Update Exqlite.Connection.connection_opt type spec and documentation.

Author: ColaCheng

lib/exqlite/connection.ex

@@ -58,6 +58,7 @@ defmodule Exqlite.Connection do
 
   @type connection_opt() ::
           {:database, String.t()}
+          | {:mode, :readwrite | :readonly | :readonly_nomutex}
           | {:journal_mode, journal_mode()}
           | {:temp_store, temp_store()}
           | {:synchronous, synchronous()}
@@ -91,7 +92,8 @@ defmodule Exqlite.Connection do
     * `:database` - The path to the database. In memory is allowed. You can use
       `:memory` or `":memory:"` to designate that.
     * `:mode` - use `:readwrite` to open the database for reading and writing
-      or `:readonly` to open it in read-only mode. `:readwrite` will also create
+      , `:readonly` to open it in read-only mode or `:readonly_nomutex` to open
+      it in read-only with nomutex mode. `:readwrite` will also create
       the database if it doesn't already exist. Defaults to `:readwrite`.
     * `:journal_mode` - Sets the journal mode for the sqlite connection. Can be
       one of the following `:delete`, `:truncate`, `:persist`, `:memory`,
@@ -159,8 +161,8 @@ defmodule Exqlite.Connection do
             "./priv/sqlite/\#{arch_dir}/vss0"
           ]
       ```
-    * `:before_disconnect` - A function to run before disconnect, either a 
-      2-arity fun or `{module, function, args}` with the close reason and 
+    * `:before_disconnect` - A function to run before disconnect, either a
+      2-arity fun or `{module, function, args}` with the close reason and
       `t:Exqlite.Connection.t/0` prepended to `args` or `nil` (default: `nil`)
 
   For more information about the options above, see [sqlite documentation][1]