Version 2.1.8

What's Changed

• Fix #120 by @chaoming0625 in #178
• feat: brainpy.Collector supports addition and subtraction by @chaoming0625 in #179
• feat: delay variables support "indices" and "reset()" function by @chaoming0625 in #180
• Support reset functions in neuron and synapse models by @chaoming0625 in #181
• update() function on longer need _t and _dt by @chaoming0625 in #183
• small updates by @chaoming0625 in #188
• feat: easier control flows with brainpy.math.ifelse by @chaoming0625 in #189
• feat: update delay couplings of DiffusiveCoupling and AdditiveCouping by @chaoming0625 in #190
• update version and changelog by @chaoming0625 in #191

Full Changelog: V2.1.7...V2.1.8