fix .ix indexer removed from pandas 1.0 (#7)

* fix .ix indexer deprecated from Pandas 1.0

* removing support for python older than 3.6.1

* removing support for python 3.4

.gitignore

@@ -3,3 +3,4 @@ build
 dist
 .cache
 *.egg-info
+.sonarlint

.travis.yml

@@ -3,9 +3,10 @@ sudo: false
 cache: pip
 python:
 - '2.7'
-- '3.4'
 - '3.5'
 - '3.6'
+- '3.7'
+- '3.8'
 install:
 - pip install -r tests/requirements.txt -r doc/requirements.txt
 - pip install -e .
@@ -23,4 +24,4 @@ deploy:
   skip_cleanup: true
   on:
     tags: true
-    python: '2.7'
+    python: '3.7'

calmap/__init__.py

@@ -235,7 +235,7 @@ def yearplot(
         dayticks = range(len(daylabels))[dayticks // 2 :: dayticks]
 
     ax.set_xlabel("")
-    ax.set_xticks([by_day.ix[datetime.date(year, i + 1, 15)].week for i in monthticks])
+    ax.set_xticks([by_day.loc[datetime.date(year, i + 1, 15)].week for i in monthticks])
     ax.set_xticklabels([monthlabels[i] for i in monthticks], ha="center")
 
     ax.set_ylabel("")

setup.py

@@ -46,8 +46,10 @@
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Topic :: Scientific/Engineering",
     ],
 )