bg(fix-typo): fix a single typo on the readme file

- fix the typo 'familar' on the readme to 'familiar'

[Fix]
diff --git a/README.md b/README.md
index c9861d4..436ee22 100644
--- a/README.md
+++ b/README.md
@@ -188,7 +188,7 @@
 
 BC5/3DC: This format has two BC4 blocks, and is usually used for XY (red/green) tangent space normal maps. The first block (output red/or X) will have the R channel of the color slice (which we assume is actually grayscale, but doesn't have to be), and the output green channel (or Y) will have all-255 blocks. We could support converting the first two color components of the color ETC1S texture slice to BC5, but doing so doesn't seem to have any practical benefits (just use BC1 or BC7). Alternately we could support allowing the user to select a source channel other than red.
 
-Note that you can directly control exactly how transcoding works at the block level by calling a lower level API, basisu_transcoder::transcode_slice(). The higher level API (transcode_image_level) uses this low-level API internally. find_slice() and get_file_info() return all the slice information you would need to call this lower level API. I would study transcode_image_level()'s implementation before using the slice API to get familar with it. The slice API was written first.
+Note that you can directly control exactly how transcoding works at the block level by calling a lower level API, basisu_transcoder::transcode_slice(). The higher level API (transcode_image_level) uses this low-level API internally. find_slice() and get_file_info() return all the slice information you would need to call this lower level API. I would study transcode_image_level()'s implementation before using the slice API to get familiar with it. The slice API was written first.
 
 2. To get uncompressed 16/24/32-bpp pixel data from a slice, the best format to transcode to is ETC1. Then unpack and convert the resulting ETC1S block data to pixels (each block will be 4x4 pixels). Internally, everything is actually just ETC1S in the baseline format. We will be adding new methods that support decompressing to a few uncompressed pixel formats as some point.