Updated for filterpy version 1.4.4

I changed the IMM filter to use the predict/update cycle, requiring
a code change in the Adaptive Filtering chapter.

Author: rlabbe

14-Adaptive-Filtering.ipynb

@@ -45,7 +45,7 @@ def test_filterpy_version():
     from distutils.version import LooseVersion
 
     v = filterpy.__version__
-    min_version = "1.4.0"
+    min_version = "1.4.4"
     if LooseVersion(v) < LooseVersion(min_version):
        raise Exception("Minimum FilterPy version supported is {}.\n"
                        "Please install a more recent version.\n"