Log Message:
Update mikutter to 3.5.2.

Upstream changes:

# mikutter 3.5.2

* Retriever.URI was not implemented as documented
* fix custom Model related bugs
 * field value dereference via [] where Model method should be called
 * accessor method was not defined when Model field type was array
* multiselect widget wrote unnecessary values each time config window was open
* fix reference of deprecated method in mikutter core
* name attribute of about method in setting DSL was not used
* adjust field values for Twitter related Models