bin/group z reducer version badge (#2036)

Author: Fil

docs/transforms/bin.md

@@ -274,7 +274,7 @@ The following named reducers are supported:
 * *y* - the middle of the bin’s *y* extent (when binning on *y*)
 * *y1* - the lower bound of the bin’s *y* extent (when binning on *y*)
 * *y2* - the upper bound of the bin’s *y* extent (when binning on *y*)
-* *z* <VersionBadge pr="1959" /> - the bin’s *z* value (*z*, *fill*, or *stroke*)
+* *z* <VersionBadge version="0.6.14" pr="1959" /> - the bin’s *z* value (*z*, *fill*, or *stroke*)
 
 In addition, a reducer may be specified as:
 

docs/transforms/group.md

@@ -370,7 +370,7 @@ The following named reducers are supported:
 * *identity* - the array of values
 * *x* <VersionBadge version="0.6.12" pr="1916" /> - the group’s *x* value (when grouping on *x*)
 * *y* <VersionBadge version="0.6.12" pr="1916" /> - the group’s *y* value (when grouping on *y*)
-* *z* <VersionBadge pr="1959" /> - the group’s *z* value (*z*, *fill*, or *stroke*)
+* *z* <VersionBadge version="0.6.14" pr="1959" /> - the group’s *z* value (*z*, *fill*, or *stroke*)
 
 In addition, a reducer may be specified as: