Fix readthedocs build (pybind#721)

RTD updated their build environment which broke the 1.8.14.dev build of doxygen that we were using. The update also breaks the conda-forge build of 1.8.13 (but that version has other issues). Luckily, the RTD update did bring their doxygen version up to 1.8.11 which is enough to parse the C++11 code we need (ref qualifiers) and it also avoids the segfault found in 1.8.13. Since we're using the native doxygen, conda isn't required anymore and we can simplify the RTD configuration. [skip ci]
mhochsteger · Mar 12, 2017 · b7017c3 · b7017c3
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diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -1,2 +1,3 @@
-conda:
-  file: docs/environment.yml
+python:
+  version: 3
+requirements_file: docs/requirements.txt
diff --git a/docs/environment.yml b/docs/environment.yml
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -0,0 +1 @@
+breathe == 4.5.0