1.8:    1.8.7-p374
1.8.7:  1.8.7-p374
1:      1.9.3-p448
1.9:    1.9.3-p484
1.9.3:  1.9.3-p484
2:      2.1.0
2.0:    2.0.0-p353
2.0.0:  2.0.0-p353
2.1:    2.1.0
2.1.0:  2.1.0
stable: 2.1.0

1.8:    1.8.7-p374
1.8.7:  1.8.7-p374
1:      1.9.3-p448
1.9:    1.9.3-p484
1.9.3:  1.9.3-p484
2:      2.1.0
2.0:    2.0.0-p353
2.0.0:  2.0.0-p353
2.1:    2.1.0
stable: 2.1.0

Remove now-redundant mapping of 2.1.0 to 2.1.0.
Remove now-redundant mapping of 2.1.0 to 2.1.0.
