detect conda environments

non-base conda environments lack bin/conda
apply same solution as pyenv#290

Author: lmmarsano

bin/pyenv-virtualenv

@@ -139,7 +139,7 @@ detect_venv() {
   # Check the existence of executables as a workaround for the issue with pyenv-which-ext
   # https://github.com/yyuu/pyenv-virtualenv/issues/26
   local prefix="$(pyenv-prefix)"
-  if [ -x "${prefix}/bin/conda" ]; then
+  if [ -d "${prefix}/conda-meta" ] || [ -x "${prefix}/bin/conda" ]; then
     HAS_CONDA=1
   else
     if [ -x "${prefix}/bin/virtualenv" ]; then