Add ignore missing dim policy, update version to 2.0.7

Author: AntonZelenin

anodot/metric.py

@@ -70,6 +70,7 @@ class Aggregation(Enum):
 class MissingDimPolicyAction(Enum):
     FILL = 'fill'
     FAIL = 'fail'
+    IGNORE = 'ignore'
 
 
 class MissingDimPolicy:

setup.py

@@ -22,5 +22,5 @@
     ],
     packages=find_packages(),
     install_requires=["requests"],
-    version='2.0.6'
+    version='2.0.7'
 )