v0.3.9

ITensors v0.3.9

Diff since v0.3.8

Merged pull requests:

• [ITensors] [ENHANCEMENT] Handle corner case of normalizing a zero MPS (#901) (@mtfishman)
• [ITensors] [ENHANCEMENT] Allow Matrix representations for operators in expect and correlation_matrix (#902) (@mtfishman)
• [ITensors] [ENHANCMENT] Haar random unitary gate (#903) (@mtfishman)