fix PATH export

Author: mvdbeek

.travis.yml

@@ -15,7 +15,7 @@ before_install:
 install:
   - pip install planemo
   - planemo conda_init
-  - export PATH=$PLANEMO_CONDA_PREFIX/bin
+  - export PATH=$PLANEMO_CONDA_PREFIX/bin:$PATH
   - conda update -y conda
   - conda create -y -q -c bioconda --name iuc_conda samtools=0.1.19 bcftools
   - . activate iuc_conda