examples: add note to examples that they are for tracing 0.2.0 #3099
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Motivation
It is not uncommon that users who are new to tracing look at the
examples in the
master
branch of the repository and find that theydon't compile. This is because they are examples which compile with the
code from the master branch, which is for the as yet unreleased tracing
0.2.0 ecosystem.
Users should instead go to the
v0.1.x
branch to find examplescompatible with the crates published on crates.io.
Solution
This change adds a doc-comment to the beginning of every example file
informing the user of this fact and suggesting that they check out the
v0.1.x
branch instead.