Add type='button' to attrib button (#177)

Fixes #178 

* Add type='button' to attrib button

Prevents form from submitting when clicked

* Add "prevent attribution from submiting" changelog

* Added issue to "Prevent attrubtuin.." bug

Author: BartInTheField

CHANGELOG.md

@@ -17,6 +17,7 @@
 ### 🐞 Bug fixes
 
 - *...Add fixed bugs here...*
+- Prevented attribution button from submiting form (#178)
 
 ## 1.14.0
 

src/ui/control/attribution_control.js

@@ -57,6 +57,7 @@ class AttributionControl {
         this._container = DOM.create('div', 'mapboxgl-ctrl mapboxgl-ctrl-attrib');
         this._compactButton = DOM.create('button', 'mapboxgl-ctrl-attrib-button', this._container);
         this._compactButton.addEventListener('click', this._toggleAttribution);
+        this._compactButton.type = 'button';
         this._setElementTitle(this._compactButton, 'ToggleAttribution');
         this._innerContainer = DOM.create('div', 'mapboxgl-ctrl-attrib-inner', this._container);
         this._innerContainer.setAttribute('role', 'list');