docs: add @nsilvestri as a contributor for ideas, and code (#345)

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -487,6 +487,16 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "nsilvestri",
+      "name": "Nick Silvestri",
+      "avatar_url": "https://avatars.githubusercontent.com/u/33607815?v=4",
+      "profile": "https://nsilvestri.me/",
+      "contributions": [
+        "ideas",
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -1,7 +1,7 @@
 # Leaflet.GeoSearch
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-51-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-52-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 **Demo and Docs: [smeijer.github.io/leaflet-geosearch](https://smeijer.github.io/leaflet-geosearch)**
@@ -422,6 +422,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <tr>
       <td align="center"><a href="https://github.com/darrenklein"><img src="https://avatars.githubusercontent.com/u/6743861?v=4?s=100" width="100px;" alt="Darren"/><br /><sub><b>Darren</b></sub></a><br /><a href="https://github.com/smeijer/leaflet-geosearch/commits?author=darrenklein" title="Code">💻</a> <a href="https://github.com/smeijer/leaflet-geosearch/commits?author=darrenklein" title="Tests">⚠️</a> <a href="https://github.com/smeijer/leaflet-geosearch/commits?author=darrenklein" title="Documentation">📖</a></td>
       <td align="center"><a href="https://paulschreiber.com/"><img src="https://avatars.githubusercontent.com/u/86784?v=4?s=100" width="100px;" alt="Paul Schreiber"/><br /><sub><b>Paul Schreiber</b></sub></a><br /><a href="https://github.com/smeijer/leaflet-geosearch/commits?author=paulschreiber" title="Code">💻</a></td>
+      <td align="center"><a href="https://nsilvestri.me/"><img src="https://avatars.githubusercontent.com/u/33607815?v=4?s=100" width="100px;" alt="Nick Silvestri"/><br /><sub><b>Nick Silvestri</b></sub></a><br /><a href="#ideas-nsilvestri" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/smeijer/leaflet-geosearch/commits?author=nsilvestri" title="Code">💻</a></td>
     </tr>
   </tbody>
   <tfoot>