Update Pillow to v6.2.2 to catch security fixes. (ibm-functions#108)

- CVE-2019-19911
  - CVE-2020-5313

Update Pillow to v6.2.2 to catch security fixes. (ibm-functions#108)

- CVE-2019-19911
  - CVE-2020-5313

Get latest security fixes with each build. (ibm-functions#106)

Get latest security fixes with each build. (ibm-functions#106)

Get curl security updates. (ibm-functions#104)

Get curl security updates. (ibm-functions#104)

Update python3.6 and python3.7 base images and packages. (ibm-functio…

…ns#100)

- for Python v3.7 see python3.7/CHANGELOG.md
  - for Python v3.6 see python3.6/CHANGELOG.md

Update python3.6 and python3.7 base images and packages. (ibm-functio…

…ns#100)

- for Python v3.7 see python3.7/CHANGELOG.md
  - for Python v3.6 see python3.6/CHANGELOG.md

Update to pip 19.2.3, add PyJWT for python3.7. (ibm-functions#95)

Update to pip 19.2.3, add PyJWT for python3.7. (ibm-functions#95)