Add mapping for 〒 (3012) to glyph for ₸ (20B8)

Closes #2

Author: ctrlcctrlv

FRBAmericanCursive-SOURCE.ufo/glyphs/_J_pnP_ostalM_ark.glif

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<glyph name="_JpnPostalMark" format="2">
+  <advance width="452"/>
+  <unicode hex="20B8"/>
+  <unicode hex="3012"/>
+  <outline>
+    <contour>
+      <point x="234" y="333" type="move"/>
+      <point x="85.2479" y="14" type="line"/>
+    </contour>
+    <contour>
+      <point x="111.299" y="413" type="move"/>
+      <point x="435.299" y="413" type="line"/>
+    </contour>
+    <contour>
+      <point x="74" y="333" type="move"/>
+      <point x="398" y="333" type="line"/>
+    </contour>
+  </outline>
+</glyph>