improve md formatting

.github/pull_request_template.md

@@ -2,22 +2,22 @@
 Here is a checklist of things that should be done to add a new case study to
 the repository:
 - [ ] The case study has been prepared from the case studies template in `templates/template_case_study.py`. This ensures that the case study:
-  - [] begins with documentation of the case
-  - [] includes a dictionary of default argument values
-  - [] is run through a function
-  - [] follows the standard order of sections:
+  - [ ] begins with documentation of the case
+  - [ ] includes a dictionary of default argument values
+  - [ ] is run through a function
+  - [ ] follows the standard order of sections:
     1. test case parameters
     2. set up of model objects
     3. initial conditions
     4. run
-  - [] includes a `__main__` routine with arg-parsing of command line arguments
+  - [ ] includes a `__main__` routine with arg-parsing of command line arguments
 - [ ] The case study has a quick-to-run test form in the relevant `test_*.py` file, so that it will be run as part of CI
 - [ ] A plotting script has been added to the relevant `plotting` directory, with a name that matches the case study script
 - [ ] Neat figures have been added to the relevant `figures` directory, with names that match the case study script
 
 # Add or update a plotting script
 Here is a checklist of things that should be done to add a new plotting script to the repository:
-- [] The plotting script has been prepared from the template in `templates/template_plot.py`
+- [ ] The plotting script has been prepared from the template in `templates/template_plot.py`
 
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