Document build dependencies about cargo-generate HOT 5 CLOSED

hey @migerh - i'm working on OSX and the travis tests run on windows and travis(linux) and i haven't run into this issue- tho i totally believe that it is one for some operating systems. i would love a PR to document this- the key work left to be done is to figure out what systems need it!

if you make a PR to throw a warning in the readme stating that you may need to sudo apt-get install pkg-config libssl-dev cmake i would happily accept, and in the meantime i'll leave this open and see if we can't get a better sense of what group of OSs need this!

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Travis has a few things pre-installed, on ubuntu trusty libssl-dev for example is one of them:

$ docker run --rm -ti travisci/ci-garnet:packer-1512502276-986baf0 dpkg -l libssl-dev
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  libssl-dev:amd 1.0.1f-1ubun amd64        Secure Sockets Layer toolkit - de

In fact, the WSL ubuntu was the first time I ran into any trouble installing cargo-generate. All my other systems installed it just fine. OS X went through because openssl was already brewed because of python.

With a clean ubuntu docker container I was able to check what is required on ubuntu:

build-essentials libssl-dev pkg-config cmake zlib1g-dev

build-essentials could possibly be broken down into smaller dependencies but it's generally not bad to have for developers. libssl-dev and pkg-config are for openssl-sys, cmake and zlib1g-dev are for libssh2-sys .

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cool- thanks for doing the research! i think a PR talking about this would be awesome! lemme know if you are up for it, otherwise i can spin something up later today :)

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closed by #45 (review)

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