added canu conda yaml (issue #72)

workflow/envs/canu.yaml

+channels:
+  - conda-forge
+  - bioconda
+  - defaults
+dependencies:
+  - _libgcc_mutex=0.1=conda_forge
+  - _openmp_mutex=4.5=1_gnu
+  - alsa-lib=1.2.3=h516909a_0
+  - atk=2.36.0=1
+  - atk-1.0=2.36.0=haf93ef1_1
+  - ca-certificates=2020.6.20=hecda079_0
+  - cairo=1.16.0=hcf35c78_1003
+  - canu=2.0=he1b5a44_0
+  - certifi=2020.6.20=py38h32f6830_0
+  - chrpath=0.16=h14c3975_1001
+  - dbus=1.13.6=he372182_0
+  - expat=2.2.9=he1b5a44_2
+  - fontconfig=2.13.1=h86ecdb6_1001
+  - freetype=2.10.2=he06d7ca_0
+  - fribidi=1.0.10=h516909a_0
+  - gdk-pixbuf=2.38.2=h3f25603_4
+  - gettext=0.19.8.1=hc5be6a0_1002
+  - giflib=5.2.1=h516909a_2
+  - glib=2.65.0=h6f030ca_0
+  - gnuplot=5.2.7=h0fb2448_3
+  - gobject-introspection=1.64.1=py38h03d966d_1
+  - graphite2=1.3.13=he1b5a44_1001
+  - gst-plugins-base=1.14.5=h0935bb2_2
+  - gstreamer=1.14.5=h36ae1b5_2
+  - gtk2=2.24.32=h586f36d_1
+  - harfbuzz=2.4.0=h9f30f68_3
+  - icu=64.2=he1b5a44_1
+  - jpeg=9d=h516909a_0
+  - lcms2=2.11=hbd6801e_0
+  - ld_impl_linux-64=2.34=hc38a660_9
+  - libclang=9.0.1=default_hde54327_0
+  - libffi=3.2.1=he1b5a44_1007
+  - libgcc-ng=9.3.0=h24d8f2e_14
+  - libgd=2.2.5=h307a58e_1007
+  - libgomp=9.3.0=h24d8f2e_14
+  - libiconv=1.15=h516909a_1006
+  - libllvm9=9.0.1=he513fc3_1
+  - libpng=1.6.37=hed695b0_1
+  - libstdcxx-ng=9.3.0=hdf63c60_14
+  - libtiff=4.1.0=hc3755c2_3
+  - libuuid=2.32.1=h14c3975_1000
+  - libwebp=1.0.2=h56121f0_5
+  - libxcb=1.13=h14c3975_1002
+  - libxkbcommon=0.10.0=he1b5a44_0
+  - libxml2=2.9.10=hee79883_0
+  - lz4-c=1.9.2=he1b5a44_1
+  - ncurses=6.2=he1b5a44_1
+  - nspr=4.27=he1b5a44_0
+  - nss=3.47=he751ad9_0
+  - openjdk=11.0.1=hacce0ff_1021
+  - openssl=1.1.1g=h516909a_1
+  - pango=1.42.4=h7062337_4
+  - pcre=8.44=he1b5a44_0
+  - perl=5.26.2=h516909a_1006
+  - perl-filesys-df=0.92=pl526h14c3975_3
+  - pip=20.2.1=py_0
+  - pixman=0.38.0=h516909a_1003
+  - pthread-stubs=0.4=h14c3975_1001
+  - python=3.8.5=h4d41432_2_cpython
+  - python_abi=3.8=1_cp38
+  - qt=5.12.5=hd8c4c69_1
+  - readline=8.0=he28a2e2_2
+  - setuptools=49.2.1=py38h32f6830_0
+  - sqlite=3.32.3=hcee41ef_1
+  - tk=8.6.10=hed695b0_0
+  - wheel=0.34.2=py_1
+  - xorg-fixesproto=5.0=h14c3975_1002
+  - xorg-inputproto=2.3.2=h14c3975_1002
+  - xorg-kbproto=1.0.7=h14c3975_1002
+  - xorg-libice=1.0.10=h516909a_0
+  - xorg-libsm=1.2.3=h84519dc_1000
+  - xorg-libx11=1.6.10=h516909a_0
+  - xorg-libxau=1.0.9=h14c3975_0
+  - xorg-libxdmcp=1.1.3=h516909a_0
+  - xorg-libxext=1.3.4=h516909a_0
+  - xorg-libxfixes=5.0.3=h516909a_1004
+  - xorg-libxi=1.7.10=h516909a_0
+  - xorg-libxrender=0.9.10=h516909a_1002
+  - xorg-libxt=1.2.0=h516909a_0
+  - xorg-libxtst=1.2.3=h516909a_1002
+  - xorg-recordproto=1.14.2=h516909a_1002
+  - xorg-renderproto=0.11.1=h14c3975_1002
+  - xorg-xextproto=7.3.0=h14c3975_1002
+  - xorg-xproto=7.0.31=h14c3975_1007
+  - xz=5.2.5=h516909a_1
+  - zlib=1.2.11=h516909a_1006
+  - zstd=1.4.5=h6597ccf_2