Typos in README.md

[BarczaD]

There are some typos in the README file:

Setup for SourceMeter analysis

Under point 5: officialy, and under point 6: releas.
(Should be officially and release.)

Visualize source code metrics

In the title: meterics, under point 3. iv: hava, and under point 4. ii: Windwos.
(Should be metrics, have and Windows.)

Compile from source

In the title: Complie, under point 2: checkout, and under point 7: aviable.
(Should be Compile, check out and available.)