ENH: Bump ITKUltrasound to 0.5.5

Author: tbirdso

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='itk-ultrasound',
-    version='0.5.4',
+    version='0.5.5',
     author='Matthew McCormick',
     author_email='matt.mccormick@kitware.com',
     packages=['itk'],