Merge branch 'bf/install-base' into 'master'

BF: is an f-string

See merge request fsl/conda/manifest-rules!18

manifest_rules/__init__.py

 #!/usr/bin/env python
 
 
-__version__ = '0.4.1'
+__version__ = '0.4.2'

manifest_rules/test_environment.py

@@ -88,7 +88,7 @@ def full_test(envfile, release_info):
         env_out = ''
     else:
         env_out = sprun(f'./fsl/bin/conda install -y '
-                        '-n base fsl-base={basever}')
+                        f'-n base fsl-base={basever}')
 
     env_out += sprun(f'./fsl/bin/conda env update -n base -f {envfile}',
                      env=env)