README.rst examples are syntactically wrong

[rbuckland]

In README.rst - the examples at line 205 to 207are syntatically wrong (unbalanced '()' brackets).

203: +--------------+----------------------------------------------+
204: | filter       | - $.objects[?(@some_field > 5)]              |
205: |              | - $.objects[?some_field = "foobar")]         |
206: |              | - $.objects[?some_field =~ "foobar")]        |
207: |              | - $.objects[?some_field > 5 & other < 2)]    |
208: +--------------+----------------------------------------------+

I do not know what it should be yet - but the parser doesn't like it.