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

API_README.md

@@ -1815,6 +1815,9 @@ 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"]`:
 
@@ -2005,7 +2008,7 @@ cog.out(get_template_field_table())
 |{lf}|A line feed: '\n', alias for {newline}|
 |{cr}|A carriage return: '\r'|
 |{crlf}|a carriage return + line feed: '\r\n'|
-|{osxphotos_version}|The osxphotos version, e.g. '0.51.1'|
+|{osxphotos_version}|The osxphotos version, e.g. '0.51.2'|
 |{osxphotos_cmd_line}|The full command line used to run osxphotos|
 |{album}|Album(s) photo is contained in|
 |{folder_album}|Folder path + album photo is contained in. e.g. 'Folder/Subfolder/Album' or just 'Album' if no enclosing folder|