Release 0.51.2, added new filter(x) to template filters (#772)

docsrc/source/template_help.rst

@@ -61,6 +61,9 @@ Valid filters are:
 * `remove(x)`: Remove x from list of values, e.g. remove(b): ['a', 'b', 'c'] => ['a', 'c'].
 * `slice(start:stop:step)`: Slice list using same semantics as Python's list slicing, e.g. slice(1:3): ['a', 'b', 'c', 'd'] => ['b', 'c']; slice(1:4:2): ['a', 'b', 'c', 'd'] => ['b', 'd']; slice(1:): ['a', 'b', 'c', 'd'] => ['b', 'c', 'd']; slice(:-1): ['a', 'b', 'c', 'd'] => ['a', 'b', 'c']; slice(::-1): ['a', 'b', 'c', 'd'] => ['d', 'c', 'b', 'a']. See also sslice().
 * `sslice(start:stop:step)`: [s(tring) slice] Slice values in a list using same semantics as Python's string slicing, e.g. sslice(1:3):'abcd => 'bc'; sslice(1:4:2): 'abcd' => 'bd', etc. See also slice().
+* ``filter(x)``\ : Filter list of values using predicate x; for example, ``{folder_album|filter(contains Events)}`` returns only folders/albums containing the word 'Events' in their path.
+* ``int``\ : Convert values in list to integer, e.g. 1.0 => 1. If value cannot be converted to integer, remove value from list. ['1.1', 'x'] => ['1']. See also float.
+* ``float``\ : Convert values in list to floating point number, e.g. 1 => 1.0. If value cannot be converted to float, remove value from list. ['1', 'x'] => ['1.0']. See also int.
 
 e.g. if Photo keywords are ``["FOO","bar"]``\ :
 
@@ -346,7 +349,7 @@ Template Substitutions
    * - {crlf}
      - a carriage return + line feed: '\r\n'
    * - {osxphotos_version}
-     - The osxphotos version, e.g. '0.51.1'
+     - The osxphotos version, e.g. '0.51.2'
    * - {osxphotos_cmd_line}
      - The full command line used to run osxphotos
    * - {album}