Remove no-longer-usable hstore--1.0--1.1.sql update script.
Since commit
865f14a2d made "=>" unusable as an operator name,
it's been impossible either to install hstore 1.0 or to execute
this update script. There's not much point in continuing
to ship it.
Discussion: https://postgr.es/m/653936.
1597431032@sss.pgh.pa.us