bump circlevis requirement to 1.0.7

requirements.txt

@@ -2,7 +2,7 @@ PyQt5==5.14.2
 circleguard==5.0.2
 packaging>=17.0
 slider==0.3.1
-circlevis==1.0.6
+circlevis==1.0.7
 # see https://github.com/pyinstaller/pyinstaller/blob/develop/tests/requirements-libraries.txt,
 # which pins matplotlib at 3.0.3 (claiming that updating causes the hooks to fail).
 # I have not checked myself if updating matplotlib cuases the build to fail.