backers) Update backers; remove the since-date since we can't get tha…

…t from Patreon

Backers.md

@@ -1,14 +1,16 @@
 Our sincerest thanks for the financial support.
 
-⭐️  Judy Bullis (since 2017/11)
+⭐️  Judy Bullis 
 
-☕️ ☕️  Colleen Hood (since 2017/11)
+☕️ ☕️  Colleen Hood 
 
-☕️  Michael Balsom (since 2017/11)
-☕️  Sebastian Gfeller (since 2018/06)
-☕️  Yujiro Hata (since 2017/12)
-☕️  Jonathan Carter (since 2018/07)
+☕️  Andrew Vickers
+☕️  Jonathan Carter 
+☕️  Michael Balsom 
+☕️  Sebastian Gfeller 
+☕️  Yujiro Hata 
 
-Ryan Niemeyer (since 2017/11)
-Peter Nicholson (since 2017/11)
-Chris Carton (since 2017/11)
+Chris Carton 
+John Merchant
+Peter Nicholson 
+Ryan Niemeyer