Actually it went:

0.12.7 -> 1.0.0 -> 1.0.1 -> 1.0.2 -> 1.0.3 -> 1.0.4 -> 1.1.0 -> 1.2.0 -> 1.3.0 -> 1.4.1 -> 1.4.2 -> 1.4.3 -> 1.5.0 -> 1.5.1 -> 1.6.0 -> 1.6.1 -> 1.6.2 -> 1.6.3 -> 1.6.4 -> 1.7.1 -> 1.8.1 -> 1.8.2 -> 1.8.3 -> 1.8.4 -> 2.0.0 -> 2.0.1 -> 2.0.2 -> 2.1.0 -> 2.2.0 -> 2.2.1 -> 2.3.0 -> 2.3.1 -> 2.3.2 -> 2.3.3 -> 2.3.4 -> 2.4.0 -> 2.5.0 -> 3.0.0 -> 3.1.0 -> 3.2.0 -> 3.3.0 -> 4.0.0

You just weren't paying attention.