mention pull/1363 which fixes issues/1262, and bump requirement up to…

… 2.1.2

README.md

@@ -27,15 +27,13 @@ However, differences should not be beyond fractional pixels.
 See below for output demos, and [vertical layout](README.vertical.md) for vertical-layout examples, [variation selector examples](variation-selectors.md).
 
 All the images are generated by the [script](gen-images.sh), using either libre fonts or fonts from Windows.
-They should be commonly accessible. Unfortunately you may need to edit the script slightly one way or the other to get
-the margin calculation done consistently ( https://github.com/harfbuzz/harfbuzz/issues/1262 ,
-https://github.com/harfbuzz/harfbuzz/issues/1248 ). `hb-view.py` itself does not use the margin values,
-so these two problems are significant only if you want to pass the numbers to `c++ hb-view`.
+They should be commonly accessible.
 
 # Requirement
 
 The descender/ascender code depends on a recent bug fix ( https://github.com/harfbuzz/harfbuzz/pull/1209 ) to harfbuzz from me.
 This was merged after HarfBuzz version 1.9.0 and first appeared in 2.0.0 (released on Oct 18, 2018).
+Another fix ( https://github.com/harfbuzz/harfbuzz/pull/1363 ) was merged and first appeared in 2.1.2 .
 
 You need to build and install harfbuzz with introspection (`./configure --with-gobject --enable-introspection`), and have pygobject
 (https://wiki.gnome.org/Projects/PyGObject). The latter should be readily available as pre-packaged on many systems. 

hb-view.py

@@ -47,7 +47,7 @@ def tounicode(s, encoding='utf-8'):
     else:
         return s
 
-if (hb.version_atleast(2,0,0)):
+if (hb.version_atleast(2,1,2)):
     pass
 else:
     raise RuntimeError('HarfBuzz too old')