Draft July report for Samza

[Yi Pan <ni...@gmail.com>]

Hi, all,

Here is the draft report I had for Samza this quarter. Please let me know
if I miss anything.

Thanks!

## Description:
- Apache Samza is a distributed stream processing engine that are highly
  configurable to process events from various data sources, including
  real-time messaging system (e.g. Kafka) and distributed file systems (e.g.
  HDFS).

## Issues:
- No issues requires board attention

## Activity:
- Samza 1.2 is released:
http://samza.apache.org/blog/2019-06-11-announcing-the-release-of-apache-samza--1.2.0

## Health report:
- Project is in healthy status with 1.1 released in Mar 2019

## PMC changes:

 - Currently 16 PMC members.
 - Boris Shkolnik was added to the PMC on Thu Jun 06 2019

## Committer base changes:

 - Currently 26 committers.
 - New commmitters:
    - Bharath Kumarasubramanian was added as a committer on Mon Jun 24 2019
    - Cameron Lee was added as a committer on Thu Apr 11 2019
    - Rayman Preet Singh was added as a committer on Mon Jul 08 2019

## Releases:

 - Last release was 1.1.0 on Thu Mar 21 2019

## /dist/ errors: 9
 - TODO - has it been fixed? Here is the link to the checker report:
https://checker.apache.org/projs/samza.html


## Mailing list activity:
 - dev@samza.apache.org:
    - 267 subscribers (down -3 in the last 3 months):
    - 215 emails sent to list (1011 in previous quarter)


## JIRA activity:

 - 107 JIRA tickets created in the last 3 months
 - 84 JIRA tickets closed/resolved in the last 3 months