GLM v1.3.7

Diff since v1.3.6

Merged pull requests:

• Update manual.md to include r2 for R^2 computation (#298) (@xiaodaigh)
• Add basic documentation to negbin (#301) (@galenlynch)
• Pass stopping criteria to mle_for_θ (#302) (@galenlynch)
• Emit warning message from mle_for_θ upon convergence failure (#303) (@galenlynch)
• Add wts keyword to lm (#341) (@pdeffebach)
• Fix passing tolerance to mle_for_θ (#355) (@nalimilan)
• Fix "wrkresᵢ not defined" error (#357) (@nalimilan)
• Install TagBot as a GitHub Action (#359) (@JuliaTagBot)
• bump patch version to 1.3.7 (#360) (@kleinschmidt)