Updated books.txt to point at Chem 2e on ezvm5 since Chem 1e is being EOL'd
Updated books.txt to point at Chem 2e on ezvm5 since Chem 1e is being EOL'd

Connexions/cnx-rulesets,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cte,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cte,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cnx-recipes,Connexions/cnx-recipes