Reduce repos >= 100 stars restriction

[donnemartin]

From the FAQ:

Why Restrict Search Results to stars:>=100 for Viz 2015?

Only repos with stars:>=100 are tracked to help filter GitHub's rapidly growing 30+ million repositories and to keep within the GitHub API rate limits.

Viz 6-, 3-, and 1-month might loosen this restriction as there should be less repos to analyze. Google BigQuery along with GitHub Archive could also supplement the GitHub API.