ARROW-5157: [Website] Add MATLAB to powered by Apache Arrow website

@kevingurney, @rdmello, @DaveBergstein, @nickhaddady, and @jeremy-hughes let me know what you think of the wording of this.  Thanks!

Author: Hatem Helal <hatem.helal@gmail.com>
Author: Hatem Helal <hhelal@mathworks.com>

Closes #4137 from hatemhelal/arrow-5157 and squashes the following commits:

4afc859e <Hatem Helal> proper case
53a39d86 <Hatem Helal> Swap engineers and scientists
6aa29dc8 <Hatem Helal> Added more info about MATLAB
96b00b24 <Hatem Helal> Add MATLAB to powered by Apache Arrow website
diff --git a/powered_by.md b/powered_by.md
index c6071db1..eb4efe8 100644
--- a/powered_by.md
+++ b/powered_by.md
@@ -90,6 +90,9 @@
   support for structured data. Uses the Arrow IPC format and targets the Arrow
   memory layout in its analytic functions. This work is part of the [GPU Open
   Analytics Initiative][11]
+* **[MATLAB][30]:** A numerical computing environment for engineers and
+  scientists. MATLAB uses Apache Arrow to support reading and writing Parquet
+  and Feather files.
 * **[OmniSci][10] (formerly MapD):** In-memory columnar SQL engine designed to run
   on both GPUs and CPUs. OmniSci supports Arrow for data ingest and data interchange
   via CUDA IPC handles. This work is part of the [GPU Open Analytics Initiative][11]
@@ -165,3 +168,4 @@
 [27]: https://github.com/apache/arrow/edit/master/site/powered_by.md
 [28]: https://github.com/uber/petastorm
 [29]: https://www.inaccel.com/
+[30]: https://www.mathworks.com