Show %-escaped parameters in Action URI template

In apiary version 2.3.0 #73 does not work anymore

```
# Group Users
Group description

### User List [GET /users{?name%5b%5d,joinedBefore,joinedAfter,sort,limit}]
A list of users

+ Parameters
+ name%5b%5d (optional, string, `alice`) ... Search for a user by name
+ joinedBefore (optional, string, `2011-01-01`) ... Search by join date
+ joinedAfter (optional, string, `2011-01-01`) ... Search by join date
+ sort = `name` (optional, string, `joined`) ... Which field to sort by
```

Gives:


### Aglio version
``` sh
$ aglio -v
aglio 2.3.0
olio 1.6.3
```