fix settings after readme test

Author: nschloe

test/test_annotate.py

@@ -37,7 +37,6 @@ def plot():
 
 def test():
     assert_equality(plot, __file__[:-3] + "_reference.tex")
-    return
 
 
 if __name__ == "__main__":

test/test_readme.py

@@ -1,6 +1,8 @@
 import pathlib
 
 import exdown
+import matplotlib as mpl
+import matplotlib.pyplot as plt
 import pytest
 
 this_dir = pathlib.Path(__file__).resolve().parent
@@ -12,3 +14,7 @@
 )
 def test_readme(string, lineno):
     exec(string)
+
+    # Close figure and reset defaults
+    plt.close()
+    mpl.rcParams.update(mpl.rcParamsDefault)