v0.7.1

PlanktonIndividuals v0.7.1

Diff since v0.7.0

Merged pull requests:

• use atomic in KernerAbstractions.jl (#68) (@zhenwu0728)
• support both Float32 and Float64 (#69) (@zhenwu0728)
• use Float32 as default (#70) (@zhenwu0728)
• update notebook dependencies (#71) (@gaelforget)