Tolerate additional dependency versions

Care has been taken to accept all dependency
versions that were acceptable before, but many
version constraints have been relaxed significantly.

Author: radioflash

.travis.yml

@@ -4,8 +4,7 @@ os:
   - osx
 julia:
   - 1.0
-  - 1.3
-  - 1.4
+  - 1.5
   - nightly
 
 branches:

Project.toml

@@ -17,14 +17,14 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 
 [compat]
-CSV = "^0.7.0"
-DataFrames = "^0.21.8"
-Combinatorics = "^1.0.2"
-Distributions = "^0.24.0"
-FFTW = "^1.2.4"
-RecipesBase = "1.1.0"
-StatsBase = "0.33.2"
-julia = "^1"
+CSV = "0.7.0, 0.8.0"
+DataFrames = "0.21, 0.22"
+Combinatorics = "1"
+Distributions = "0.24"
+FFTW = "1"
+RecipesBase = "1"
+StatsBase = "0.33"
+julia = "1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"