v0.8.0

TensorTrains v0.8.0

Diff since v0.7.0

Merged pull requests:

• Use generic trace methods when possible (#16) (@abraunst)
• Add benchmarking with PkgBenchmark.jl (#17) (@stecrotti)
• Add run_benchmark.jl file (#18) (@stecrotti)
• only call accumulate_R when debugging on normalize! (#19) (@abraunst)
• Release v0.8 (#20) (@stecrotti)