Fix nightly failures of usage of with

[jaakkor2]

PR #95 showed

WARNING: both LibGit2 and Base export "with"; uses of it in module Main must be qualified

[jaakkor2]

Now nightly fails with

compat_file: Test Failed at D:\a\RegistryTools.jl\RegistryTools.jl\test\regedit.jl:333
Expression: read(compat_file, String) == "[1]\njulia = "1.3.0-1"\n"
Evaluated: "[1]\njulia = "1.3.0 - 1"\n" == "[1]\njulia = "1.3.0-1"\n"

i.e., string formatting has added space characters

[GunnarFarneback]

This looks like a strict improvement regardless of nightly failures.