Fix punctuation and clarity in README and LICENSE

[iandrade00]

Issue Prelude

Please complete these steps and check these boxes (by putting an x inside the brackets) before filing your issue:

• [ x] I have read and understood YCM's CONTRIBUTING document.
• [ x] I have read and understood YCM's CODE_OF_CONDUCT document.
• [ x] I have read and understood YCM's README, especially the Frequently Asked Questions section.
• [ x] I have searched YCM's issue tracker to find issues similar to the one I'm about to report and couldn't find an answer to my problem. (Example Google search.)
• [ x] If filing a bug report, I have included the output of vim --version.
• [ x] If filing a bug report, I have included the output of :YcmDebugInfo.
• [ x] If filing a bug report, I have attached the contents of the logfiles using the :YcmToggleLogs command.
• [ x] If filing a bug report, I have included which OS (including specific OS version) I am using.
• [ x] If filing a bug report, I have included a minimal test case that reproduces my issue, using vim -Nu /path/to/YCM/vimrc_ycm_minimal, including what I expected to happen and what actually happened.
• [ x] If filing a installation failure report, I have included the entire output of install.py (or cmake/make/ninja) including its invocation
• [ x] I understand this is an open-source project staffed by volunteers and that any help I receive is a selfless, heartfelt gift of their free time. I know I am not entitled to anything and will be polite and courteous.
• [ x] I understand my issue may be closed if it becomes obvious I didn't actually perform all of these steps.

Thank you for adhering to this process! It ensures your issue is resolved quickly and that neither your nor our time is needlessly wasted.

Issue Details

Provide a clear description of the problem, including the following key questions:

Fix punctuation and clarity in README and LICENSE

README
-Add a comma in "cost-effective charity, Against Malaria Foundation" for clarity.
-Change "It works on Windows, Mac, and Linux!" to improve sentence flow.

 LICENSE
 - Add clarification and punctuation in the license section: "While the license is permissive, I ask that you do not distribute free copies of this software unless you have significantly changed it."

• What did you do? Read the documentation.

Include steps to reproduce here.

1. Open README
2. Open LICENSE

Include description of a minimal test case, including any actual code required to reproduce the issue.

If you made changes to vimrc_ycm_minimal, pase them here:

<contents of ycm_vimrc_minimal>

• What did you expect to happen?

Include description of the expected behaviour. Punctuation and clarity in README and LICENSE is slightly off.

• What actually happened?

Include description of the observed behaviour, including actual output, screenshots, etc.

Diagnostic data

Output of vim --version

Paste output here

Output of YcmDebugInfo

Paste output here

Output of YcmDiags

Paste output here

Output of git rev-parse HEAD in YouCompleteMe installation directory

paste output here

Contents of YCM, ycmd and completion engine logfiles

Reproduce the issue with vim -Nu /path/to/YCM/vimrc_ycm_minimal, which enabled debug logging and other useful diagnostics. Include a link to a gist containing all of the log files listed by :YcmToggleLogs.

OS version, distribution, etc.

Include system information here.

Output of build/install commands

Include link to a gist containing the invocation and entire output of install.py if reporting an installation issue.