Add missing space in cairo error

dstansby · dstansby · commit e38f4e934e6b · 2020-07-12T18:50:28.000+01:00
diff --git a/lib/matplotlib/backends/backend_cairo.py b/lib/matplotlib/backends/backend_cairo.py
@@ -21,7 +21,7 @@
         import cairocffi as cairo
     except ImportError as err:
         raise ImportError(
-            "cairo backend requires that pycairo>=1.11.0 or cairocffi"
+            "cairo backend requires that pycairo>=1.11.0 or cairocffi "
             "is installed") from err
 
 from .. import cbook, font_manager
