changelog: fix formatting

Author: james-d-mitchell

docs/source/changelog.rst

@@ -11,10 +11,12 @@ v0.4.0 (released 04/10/2022)
 ----------------------------
 
 This is a minor release with a couple of new features added: 
+
 * ``libsemigroups`` constants ``POSITIVE_INFINITY``, ``NEGATIVE_INFINITY``, and
   ``UNDEFINED`` are properly supported; 
 * ``libsemigroups::matrix_helper::pow`` is added as a method for ``__pow__``
   for some types of matrices (those not defined over a runtime semiring);
+
 and some minor improvements (the tests now use ``pytest`` exclusively).
 
 v0.3.0 (released 29/09/2022)

etc/deploy-doc.sh

@@ -1,6 +1,12 @@
 #!/bin/bash
 set -e
 
+if ! [[ -d "gh-pages" ]] ; then
+    echo -e "Error, the \"gh-pages\" directory is not present:"
+    echo -e "git clone --branch=gh-pages git@github.com:libsemigroups/libsemigroups_pybind11.git gh-pages"
+    exit 1 
+fi
+
 printf "\033[0;32mDeploying updates to GitHub...\033[0m\n"
 
 make clean-doc # to remove old doc files