Fix broken links in README.md

[aquova]

Fixes broken links regarding logging level settings. As far as
I can tell, these links have never been valid, and should direct
to the information regarding VSCodeVim's settings.

What this PR does / why we need it:
There are two links in the read me that currently don't redirect anywhere due to non-existent headers. This fixes those links.

Which issue(s) this PR fixes
#3827

Special notes for your reviewer:

[TravisBuddy]

Travis tests have failed

Hey @aquova,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: 8

View build log

if [[ $(git diff-index HEAD -- *.js *.ts *.md) ]]; then git diff; echo "Prettier Failed. Run `gulp forceprettier` and commit changes to resolve."; exit 1; fi

The command "if [[ $(git diff-index HEAD -- *.js *.ts *.md) ]]; then git diff; echo "Prettier Failed. Run `gulp forceprettier` and commit changes to resolve."; exit 1; fi" exited with 0.

$ npm run build

> [email protected] build /home/travis/build/VSCodeVim/Vim
> gulp build

[04:20:43] Using gulpfile ~/build/VSCodeVim/Vim/gulpfile.js
[04:20:43] Starting 'build'...
[04:20:43] Starting 'prettier'...
[04:20:45] Finished 'prettier' after 2.24 s
[04:20:45] Starting 'tsc'...
[04:20:45] Starting 'tslint'...
[04:20:53] Finished 'tslint' after 7.73 s
[04:21:02] Finished 'tsc' after 17 s
[04:21:02] Starting 'commit-hash'...
[04:21:02] Finished 'commit-hash' after 28 ms
[04:21:02] Finished 'build' after 19 s
The command "npm run build" exited with 0.

$ npm test --silent
### VS Code Extension Test Run ###

Current working directory: /home/travis/build/VSCodeVim/Vim
Downloaded VS Code 1.35.1
Running extension tests: /home/travis/build/VSCodeVim/Vim/.vscode-test/vscode-1.35.1/VSCode-linux-x64/code /home/travis/build/VSCodeVim/Vim/out/test --extensionDevelopmentPath=/home/travis/build/VSCodeVim/Vim --extensionTestsPath=/home/travis/build/VSCodeVim/Vim/out/test --locale=en
Tests exited with code: 1
The command "npm test --silent" exited with 1.



Done. Your build exited with 1.

npm test --silent

### VS Code Extension Test Run ###

Current working directory: /home/travis/build/VSCodeVim/Vim
Downloaded VS Code 1.35.1
Running extension tests: /home/travis/build/VSCodeVim/Vim/.vscode-test/vscode-1.35.1/VSCode-linux-x64/code /home/travis/build/VSCodeVim/Vim/out/test --extensionDevelopmentPath=/home/travis/build/VSCodeVim/Vim --extensionTestsPath=/home/travis/build/VSCodeVim/Vim/out/test --locale=en
Tests exited with code: 1

TravisBuddy Request Identifier: a9513450-9249-11e9-b30b-d1962db218c4