Fix License formatting

[mimetypes]

Adjust the license so it matches the official format: https://opensource.org/licenses/MIT
This should fix #13

[Empty2k12]

Thanks, that was quick. Hacktoberfest has not started yet, so this won't count to your stats :(

I am not sure if it will count if I go ahead and merge it in October, as I think the PR has to be opened in October. What should we do?

[Empty2k12]

It would also need to be updated here https://github.com/Empty2k12/influxdb-rust/blob/master/Cargo.toml#L8-L10, so Cargo can read the renamed file.

[Empty2k12]

I just checked The Manifest Format

# This is an SPDX 2.1 license expression for this package. Currently
# crates.io will validate the license provided against a whitelist of
# known license and exception identifiers from the SPDX license list
# 2.4. Parentheses are not currently supported.
#
# Multiple licenses can be separated with a `/`, although that usage
# is deprecated. Instead, use a license expression with AND and OR
# operators to get more explicit semantics.
license = "..."

# If a package is using a nonstandard license, then this key may be specified in
# lieu of the above key and must point to a file relative to this manifest
# (similar to the readme key).
license-file = "..."

Do you think it would make sense to replace license-file = "LICENSE" with license = "MIT" for being extra clear?

[mimetypes]

Silly me, I totally forgot about the october part in Hacktoberfest.
The issue just caught my eye by accident, please feel free to handle this how you seem fit, I dont really care that much about the stats.

[mimetypes]

Do you think it would make sense to replace license-file = "LICENSE" with license = "MIT" for being extra clear?

Looking at some official crates this does indeed seem like the way to go

[Empty2k12]

Thank you for the change! I appreciate it!

I will go ahead and merge it now, but please feel free to come back anytime (or during October) to get your PRs counting for Octoberfest!