Update beets to 1.3.18:

Dependencies:
* PyYAML 3.11
* Unidecode 0.4.19
* beets 1.3.18
* colorama 0.3.7
* enum34 1.1.6
* jellyfish 0.5.4
* munkres 1.0.7
* musicbrainzngs 0.6
* mutagen 1.32

libs/unidecode/x021.py

@@ -1,7 +1,7 @@
 data = (
 '',    # 0x00
 '',    # 0x01
-'',    # 0x02
+'C',    # 0x02
 '',    # 0x03
 '',    # 0x04
 '',    # 0x05
@@ -12,7 +12,7 @@ data = (
 '',    # 0x0a
 '',    # 0x0b
 '',    # 0x0c
-'',    # 0x0d
+'H',    # 0x0d
 '',    # 0x0e
 '',    # 0x0f
 '',    # 0x10
@@ -20,22 +20,22 @@ data = (
 '',    # 0x12
 '',    # 0x13
 '',    # 0x14
-'',    # 0x15
+'N',    # 0x15
 '',    # 0x16
 '',    # 0x17
 '',    # 0x18
-'',    # 0x19
-'',    # 0x1a
+'P',    # 0x19
+'Q',    # 0x1a
 '',    # 0x1b
 '',    # 0x1c
-'',    # 0x1d
+'R',    # 0x1d
 '',    # 0x1e
 '',    # 0x1f
 '(sm)',    # 0x20
 'TEL',    # 0x21
 '(tm)',    # 0x22
 '',    # 0x23
-'',    # 0x24
+'Z',    # 0x24
 '',    # 0x25
 '',    # 0x26
 '',    # 0x27
@@ -45,12 +45,12 @@ data = (
 'A',    # 0x2b
 '',    # 0x2c
 '',    # 0x2d
-'',    # 0x2e
-'',    # 0x2f
-'',    # 0x30
-'',    # 0x31
+'e',    # 0x2e
+'e',    # 0x2f
+'E',    # 0x30
+'F',    # 0x31
 'F',    # 0x32
-'',    # 0x33
+'M',    # 0x33
 '',    # 0x34
 '',    # 0x35
 '',    # 0x36
@@ -59,20 +59,20 @@ data = (
 '',    # 0x39
 '',    # 0x3a
 'FAX',    # 0x3b
-'[?]',    # 0x3c
-'[?]',    # 0x3d
-'[?]',    # 0x3e
-'[?]',    # 0x3f
+'',    # 0x3c
+'',    # 0x3d
+'',    # 0x3e
+'',    # 0x3f
 '[?]',    # 0x40
 '[?]',    # 0x41
 '[?]',    # 0x42
 '[?]',    # 0x43
 '[?]',    # 0x44
-'[?]',    # 0x45
-'[?]',    # 0x46
-'[?]',    # 0x47
-'[?]',    # 0x48
-'[?]',    # 0x49
+'D',    # 0x45
+'d',    # 0x46
+'e',    # 0x47
+'i',    # 0x48
+'j',    # 0x49
 '[?]',    # 0x4a
 '[?]',    # 0x4b
 '[?]',    # 0x4c