fix: add extra dependencies for 2019.1

[mob-sakai]

Changes

• Fix error: libunwind.so.8: cannot open shared object file: No such file or directory (2019.1.x) #57
• Add dependencies for 2019.1
  • libnotify4
  • libunwind-dev
  • libssl1.0

Checklist

• Read the contribution guide and accept the code of conduct
• Readme (updated or not needed)

Versions and modules to be fixed

Tested with #60 (in my repo)

Module	Fixed?
Base (Linux-Mono)	❌ -> ✅
Windows-Mono	❌ -> ✅
Mac-Mono	❌ -> ✅
Android	❌ -> ✅
iOS	❌ -> ✅
WebGL	❌ -> ✅
Linux-IL2CPP	❌ -> ✅ (with #61)

Increased image size

About 10 MB.

REPOSITORY   TAG       IMAGE ID       CREATED              SIZE
editor       before    e0a43d920df0   About a minute ago   4.02GB
editor       after     bf3c52bbd759   1 second ago         4.03GB

Test:

FROM unityci/editor:2019.1.14f1-base-0

RUN apt-get -q update \
  && apt-get -q install -y --no-install-recommends --allow-downgrades \
    libnotify4 \
    libunwind-dev \
    libssl1.0  \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*