Update mmcv_maximum_version (#4823)

* Update mmcv_maximum_version

* Update doc

docs/get_started.md

@@ -11,14 +11,14 @@ The compatible MMDetection and MMCV versions are as below. Please install the co
 
 | MMDetection version |    MMCV version     |
 |:-------------------:|:-------------------:|
-| master              | mmcv-full>=1.2.4, <1.3|
-| 2.10.0              | mmcv-full>=1.2.4, <1.3|
-| 2.9.0               | mmcv-full>=1.2.4, <1.3|
-| 2.8.0               | mmcv-full>=1.2.4, <1.3|
-| 2.7.0               | mmcv-full>=1.1.5, <1.3|
-| 2.6.0               | mmcv-full>=1.1.5, <1.3|
-| 2.5.0               | mmcv-full>=1.1.5, <1.3|
-| 2.4.0               | mmcv-full>=1.1.1, <1.3|
+| master              | mmcv-full>=1.2.4, <1.4.0 |
+| 2.10.0              | mmcv-full>=1.2.4, <1.4.0 |
+| 2.9.0               | mmcv-full>=1.2.4, <1.4.0 |
+| 2.8.0               | mmcv-full>=1.2.4, <1.4.0 |
+| 2.7.0               | mmcv-full>=1.1.5, <1.4.0 |
+| 2.6.0               | mmcv-full>=1.1.5, <1.4.0 |
+| 2.5.0               | mmcv-full>=1.1.5, <1.4.0 |
+| 2.4.0               | mmcv-full>=1.1.1, <1.4.0 |
 | 2.3.0               | mmcv-full==1.0.5    |
 | 2.3.0rc0            | mmcv-full>=1.0.2    |
 | 2.2.1               | mmcv==0.6.2         |

mmdet/__init__.py

@@ -16,7 +16,7 @@ def digit_version(version_str):
 
 
 mmcv_minimum_version = '1.2.4'
-mmcv_maximum_version = '1.3'
+mmcv_maximum_version = '1.4.0'
 mmcv_version = digit_version(mmcv.__version__)